References analysis of the Wikipedia article "List of undisputed world boxing champions" in the English version

espn.com

Rafael, Dan (April 6, 2006). "Notebook: Mayweather is in the zone". ESPN. Archived from the original on June 7, 2018. Retrieved July 17, 2021.

Coppinger, Mike (November 9, 2023). "Terence Crawford stripped of IBF title; Jaron Ennis now champ". ESPN. Archived from the original on November 10, 2023. Retrieved November 10, 2023.

Rafael, Dan (August 30, 2017). "Terence Crawford vacates IBF 140-pound world title he won on Aug. 19". ESPN. Archived from the original on October 21, 2017. Retrieved May 20, 2018.

ibf-usba-boxing.com

"IBF/USBA Rules Governing Championship Contests" (PDF). IBF. May 2006. pp. 10–11. Retrieved November 15, 2008. For the purpose of unification of titles, the Champions of the World Boxing Association ('WBA') and the World Boxing Council ('WBC') may be designated as 'elite contenders' and may be permitted to fight for the unified title. Unification bouts with other organizations will be considered on a case to case basis.

"IBF Ratings". IBF. February 2007. Archived from the original on February 2, 2007. Retrieved November 15, 2008.

IBF (June 26, 2024). "IBF Heavyweight title status". IBF. Archived from the original on June 26, 2024. Retrieved June 27, 2024.

newspapers.com

"Gene Tunney Retires From Ring". The Wetumpka Herald. Wetumpka, Alabama. August 2, 1928. Retrieved October 22, 2021 – via Newspapers.com.

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"Louis Retires; Will Promote Title Fight". The Central New Jersey Home News. New Brunswick, New Jersey. March 1, 1949. Retrieved October 22, 2021 – via Newspapers.com.

"Marciano Retires From Ring As Unbeaten World Champion". The Central New Jersey Home News. New Brunswick, New Jersey. April 27, 1956. Retrieved October 22, 2021 – via Newspapers.com.

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Mahon, Jack (July 28, 1938). "Solons vacate J.H.Lewis' title". Daily News. New York, New York. Retrieved October 22, 2021 – via Newspapers.com.

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Ham, Jack (July 18, 1946). "New York Ring Group Silent on Graziano". The Tampa Tribune. Tampa, Florida. Retrieved October 21, 2021 – via Newspapers.com.

Ham, Jack (December 19, 1952). "Sugar Ray Robinson Positively Retires From Boxing Through NBA vacates Middleweight title in favor of other pursuits". Standard-Speaker. Hanzleton, Pennsylvania. Retrieved October 21, 2021 – via Newspapers.com.

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"WBC RATINGS FOR FEBRUARY". Tampa Bay Times. St. Petersburg, Florida. March 6, 1975. Retrieved October 19, 2021 – via Newspapers.com.

Cotey, John C. (April 22, 2004). "IBF strips Wright of its title". Tampa Bay Times. St. Petersburg, Florida. Retrieved May 19, 2018 – via Newspapers.com.

"Mickey Walker suspended". The Morning Call. Allentown, Pennsylvania. June 7, 1923. Retrieved October 22, 2021 – via Newspapers.com.

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"Ladd Signs With Houston But Davis Still Has Say". Dayton Daily News. Dayton, Ohio. June 8, 1966. Retrieved October 19, 2021 – via Newspapers.com.

"Napoles title stripped". The Windsor Star. Windsor, Ontario. May 17, 1975. Retrieved October 22, 2021 – via Newspapers.com.

""Feeling Is Gone" So Leonard Retires". Lancaster New Era. Lancaster, Pennsylvania. November 10, 1982. Retrieved October 19, 2021 – via Newspapers.com.

"Boxing". The Philadelphia Inquirer. Philadelphia, Pennsylvania. January 6, 1987. Retrieved October 22, 2021 – via Newspapers.com.

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"Duilio Loi has retired". The Age. Melbourne, Victoria. September 21, 1932. Retrieved October 25, 2021 – via Newspapers.com.

"Fuji stripped of WBC title". The Spokesman-Review. Spokane, Washington. November 15, 1968. Retrieved October 19, 2021 – via Newspapers.com.

"Benny Leonard Vacates Title". The Fresno Bee. Fresno, California. January 16, 1925. Retrieved October 22, 2021 – via Newspapers.com.

"Barney Ross gives up Lightweight title". The Herald-Press. Saint Joseph, Michigan. April 15, 1935. Retrieved October 22, 2021 – via Newspapers.com.

"Lou Ambers title vacated by NBA". Daily News. New York, New York. March 26, 1940. Retrieved October 22, 2021 – via Newspapers.com.

"Angott Quits Boxing Forfeits Title Stolz And Larkin Are Leading Contenders, Says NBA Head". Deseret News. Salt Lake City, Utah. November 14, 1942. Retrieved October 22, 2021 – via Newspapers.com.

"Sked Ortiz "Title" fight for Jan. 29 in Mexico". Daily News. New York, New York. October 25, 1966. Retrieved October 18, 2021 – via Newspapers.com.

"Ismael Laguna is stripped of Lightweight championship". Modesto Bee. Modesto, California. September 16, 1970. Retrieved October 18, 2021 – via Newspapers.com.

"Buchanan loses WBC title". Asbury Park Press. Asbury Park, New Jersey. June 26, 1971. Retrieved October 18, 2021 – via Newspapers.com.

"Roberto Duran has renounced his World Boxing Association lightweight title". The Record. Hackensack, New Jersey. February 2, 1979. Retrieved October 18, 2021 – via Newspapers.com.

"The International Boxing Federation official ratings as of Feb. 1992". The Great Falls Tribune. Great Falls, Montana. February 28, 1992. Retrieved October 22, 2021 – via Newspapers.com.

Neil, Edward (January 1, 1930). "Abolish "Freak" Titles in New York". The Morning News. Wilmington, Delaware. Retrieved October 20, 2021 – via Newspapers.com.

"Kobayashi Stripped Of Title". The Cincinnati Enquirer. Cincinnati, Ohio. January 20, 1969. Retrieved October 20, 2021 – via Newspapers.com.

"Battalino title is lost on scales before bout". The Billings Gazette. Billings, Montana. January 28, 1932. Retrieved October 26, 2021 – via Newspapers.com.

"Armstrong abandons featherweight title". The News-Herald. Franklin, Pennsylvania. September 13, 1938. Retrieved October 26, 2021 – via Newspapers.com.

"Not Recognized As Champion". Honolulu Star-Bulletin. Honolulu, Hawaii. March 29, 1940. Retrieved October 26, 2021 – via Newspapers.com.

"Saddler Stripped Of Featherweight Crown". The Sacramento Bee. Raleigh, North Carolina. January 17, 1957. Retrieved October 26, 2021 – via Newspapers.com.

"Saldivar Wins, Retires". The Arizona Republic. Phoenix, Arizona. October 15, 1967. Retrieved October 26, 2021 – via Newspapers.com.

"Abe Goldstein recognized as Bantamweight champion in New York State". The Standard Union. Brooklyn, New York. October 20, 1923. Retrieved October 29, 2021 – via Newspapers.com.

"National Association Makes' Rules Which Will Speed up Bouts–Ignores New York Board". Star–Gazette. Elmira, New York. October 19, 1926. Retrieved October 29, 2021 – via Newspapers.com.

"Georgie Pace Named Bantamweight Champ". The Courier–News. Bridgewater, New Jersey. October 27, 1939. Retrieved October 31, 2021 – via Newspapers.com.

"Carruthers Retires From Ring". Hartford Courant. Hartford, Connecticut. May 17, 1954. Retrieved October 31, 2021 – via Newspapers.com.

"Cohen stripped of world bantam crown by WBA". Wisconsin State Journal. Madison, Wisconsin. December 24, 1954. Retrieved October 31, 2021 – via Newspapers.com.

"Becerra retires after knockout by Elroy Sanchez". The Boston Globe. Boston, Massachusetts. August 31, 1960. Retrieved October 31, 2021 – via Newspapers.com.

"Vacate title". Daily News. New York City, New York. Associated Press. January 6, 1973. Retrieved July 17, 2019 – via Newspapers.com.

"Pancho Villa, Flyweight Boxing Champion, Dies Today Succumbs In West After Operation On His Jaw". The Capital Times. Madison, Wisconsin. July 14, 1925. Retrieved November 6, 2021 – via Newspapers.com.

"Fidel Labarba Formally Quits Flyweight Throne". Argus-Leader. Sioux Falls, South Dakota. August 30, 1927. Retrieved November 6, 2021 – via Newspapers.com.

"Lynch Kayoes Jackie Jurich! San Jose Flyweight Stopped in Twelfth; World Title Vacated". Oakland Tribune. Oakland, California. June 29, 1938. Retrieved November 6, 2021 – via Newspapers.com.

"Jackie Paterson Stripped of Title For Failure to Battle Dado Marino". Chattanooga Daily Times. Chattanooga, Tennessee. July 31, 1947. Retrieved November 6, 2021 – via Newspapers.com.

"Flyweight Champion Monghan retires". Des Moines Tribune. Des Moines, Iowa. March 30, 1950. Retrieved November 6, 2021 – via Newspapers.com.

"Italy's Burruni Stripped of Title". Wisconsin State Journal. Madison, Wisconsin. November 2, 1965. Retrieved November 6, 2021 – via Newspapers.com.

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nytimes.com

"Spinks Stripped of Crown; W.B.C. Recognizes Norton". The New York Times. Associated Press. March 19, 1978. Archived from the original on July 8, 2019. Retrieved July 17, 2021.

Martinez, Michael (December 15, 1992). "BOXING; Bowe Trashes His W.B.C. Title Belt". The New York Times. Archived from the original on October 29, 2021. Retrieved November 1, 2021.

wbcboxing.com

web.archive.org

Compare "WBC Bantamweight Ratings (incl. WBO)". WBC. Archived from the original on August 3, 2004. Retrieved November 15, 2008. and
"WBC Bantamweight Ratings (excl. WBO)". WBC. Archived from the original on February 4, 2004. Retrieved November 15, 2008.

"IBF Ratings". IBF. February 2007. Archived from the original on February 2, 2007. Retrieved November 15, 2008.

"Spinks Stripped of Crown; W.B.C. Recognizes Norton". The New York Times. Associated Press. March 19, 1978. Archived from the original on July 8, 2019. Retrieved July 17, 2021.

Martinez, Michael (December 15, 1992). "BOXING; Bowe Trashes His W.B.C. Title Belt". The New York Times. Archived from the original on October 29, 2021. Retrieved November 1, 2021.

"Hard-Hitting Federal Judge Strips Lewis of WBA Title". Los Angeles Times. April 13, 2000. Archived from the original on July 17, 2021. Retrieved November 1, 2021.

IBF (June 26, 2024). "IBF Heavyweight title status". IBF. Archived from the original on June 26, 2024. Retrieved June 27, 2024.

Rafael, Dan (April 6, 2006). "Notebook: Mayweather is in the zone". ESPN. Archived from the original on June 7, 2018. Retrieved July 17, 2021.

Stumberg, Patrick (March 27, 2019). "Usyk officially vacates WBA cruiserweight belt". Badlefthook. Archived from the original on May 18, 2021. Retrieved September 24, 2021.

Lorenz, Rich (October 10, 1985). "WBC takes away 1 of Spinks' titles". Chicago Tribune. Archived from the original on July 8, 2019. Retrieved July 7, 2019.

Leon, Gregory (November 18, 2022). "Roy Relinquishes IBF Title!". Boxingtime. Archived from the original on November 20, 2002. Retrieved June 18, 2022.

Donovan, Jake (July 26, 2024). "Saul 'Canelo' Alvarez stripped of IBF 168-pound title ahed of Sept. 14 Edgar Berlanga showdown". The Ring. Archived from the original on July 26, 2024. Retrieved July 26, 2024.

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Naghten, Tom (August 3, 2023). "Jermell Charlo to be stripped of WBO super-welterweight title, Tim Tszyu to be elevated to champion". The Sporting News. Archived from the original on August 16, 2023. Retrieved September 29, 2023.

Coppinger, Mike (November 9, 2023). "Terence Crawford stripped of IBF title; Jaron Ennis now champ". ESPN. Archived from the original on November 10, 2023. Retrieved November 10, 2023.

CBC Sports (October 9, 2003). "Lucas, Gatti granted title shots". CBC News. Archived from the original on September 29, 2021. Retrieved September 29, 2021.

Rafael, Dan (August 30, 2017). "Terence Crawford vacates IBF 140-pound world title he won on Aug. 19". ESPN. Archived from the original on October 21, 2017. Retrieved May 20, 2018.

Milano, Jesús (May 14, 2022). "WBA Super Lightweight title is now vacant". WBA. Archived from the original on May 14, 2022. Retrieved May 15, 2022.

WBC (August 1, 2023). "Update of WBC lightweight and super lightweight divisions". WBC. Archived from the original on August 2, 2023. Retrieved August 2, 2023.

Songalia, Ryan (January 13, 2023). "Naoya Inoue vacates undisputed bantamweight championship, will move up to 122 pounds". The Ring. Archived from the original on January 14, 2023. Retrieved January 14, 2023.

List of undisputed world boxing champions (English Wikipedia)

badlefthook.com

bbc.co.uk

news.bbc.co.uk

boxingtalk.net

cbc.ca

chicagotribune.com

espn.com

ibf-usba-boxing.com

latimes.com

newspapers.com

nytimes.com

ringtv.com

sportingnews.com

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wbaboxing.com

wbcboxing.com

web.archive.org