Chicago Group Portrait (Box Set) (CD booklet archived online). New York City, NY: Columbia Records. 1991. Archived from the original on December 29, 2020. Retrieved March 25, 2019 – via Album Liner Notes.com.
Ruhlmann, William James (1991). Group Portrait (CD booklet archived online). New York City, NY: Columbia Records. Archived from the original on February 14, 2016. Retrieved March 25, 2019 – via Album Liner Notes.com.
"Out of the Box: Chicago". The Detroit News and Free Press. Detroit, Michigan. October 27, 1991. p. 4Q. Retrieved March 25, 2019 – via Newspapers.com.
web.archive.org
Chicago Group Portrait (Box Set) (CD booklet archived online). New York City, NY: Columbia Records. 1991. Archived from the original on December 29, 2020. Retrieved March 25, 2019 – via Album Liner Notes.com.
Ruhlmann, William James (1991). Group Portrait (CD booklet archived online). New York City, NY: Columbia Records. Archived from the original on February 14, 2016. Retrieved March 25, 2019 – via Album Liner Notes.com.