"Tom Wintringham". History Learning Site. February 16, 2011. Archived from the original on April 23, 2014. Retrieved April 21, 2014.
idaillinois.org
Greene, Paul B. (August 6, 1942). "He Teaches Toughness to Soldiers"(PDF). The Sentinel: American Jewish Weekly. Vol. CXXVII, no. 6. Chicago. Archived from the original(PDF) on April 17, 2014. Retrieved April 16, 2014.
Levy, Bert "Yank" (1941). Guerrilla Warfare. Introduction by Tom Wintringham. Victoria, Australia: Melbourne Penguin Books. Archived from the original(PDF) on April 29, 2014. Retrieved April 21, 2014.
solargeneral.com
Levy, "Yank" Bert (1964) [1942]. Guerrilla Warfare(PDF). Introduction to the 1964 edition by Franklin Mark Osanka; 1964 Editor's Notes by Robert K. Brown. Boulder, Colorado: Paladin Press. p. 12. ISBN0-87364-020-9. Archived(PDF) from the original on April 22, 2014. Retrieved April 15, 2014.
"Bert "Yank" Levy"(PDF). Redpath Chautauqua Collection (Brochure). White Plains, New York: The Redpath Bureau. Archived(PDF) from the original on April 21, 2014. Retrieved April 16, 2014. republished at The University Libraries, University of Iowa
uws.ac.uk
specialcollections.uws.ac.uk
Listed in "Penguin Specials 1938–1944: S1–S155" (University of the West of Scotland Library, 2006) as published in 1942. The book itself says "Published in Penguin Books 1941".
"Bert "Yank" Levy"(PDF). Redpath Chautauqua Collection (Brochure). White Plains, New York: The Redpath Bureau. Archived(PDF) from the original on April 21, 2014. Retrieved April 16, 2014. republished at The University Libraries, University of Iowa
Levy, "Yank" Bert (1964) [1942]. Guerrilla Warfare(PDF). Introduction to the 1964 edition by Franklin Mark Osanka; 1964 Editor's Notes by Robert K. Brown. Boulder, Colorado: Paladin Press. p. 12. ISBN0-87364-020-9. Archived(PDF) from the original on April 22, 2014. Retrieved April 15, 2014.
""Yank" Levy". penguin.co.uk. Penguin Books. April 21, 2014. Archived from the original on October 31, 2010. Retrieved April 21, 2014.
"Tom Wintringham". History Learning Site. February 16, 2011. Archived from the original on April 23, 2014. Retrieved April 21, 2014.
Levy, Bert "Yank" (1941). Guerrilla Warfare. Introduction by Tom Wintringham. Victoria, Australia: Melbourne Penguin Books. Archived from the original(PDF) on April 29, 2014. Retrieved April 21, 2014.
Greene, Paul B. (August 6, 1942). "He Teaches Toughness to Soldiers"(PDF). The Sentinel: American Jewish Weekly. Vol. CXXVII, no. 6. Chicago. Archived from the original(PDF) on April 17, 2014. Retrieved April 16, 2014.