Ruhlmann, William James (1991). Chicago Group Portrait (Box Set)(CD booklet archived online) (Media notes). New York City, NY: Columbia Records. p. 6. Archived from the original on November 12, 2017. Retrieved February 7, 2019.
Chicago Group Portrait (Box Set) (Media notes). New York City, NY: Columbia Records. 1991. Archived from the original(CD booklet archived online) on December 29, 2020. Retrieved February 7, 2019.
Chicago Group Portrait (Box Set) (Media notes). New York City, NY: Columbia Records. 1991. Archived from the original(CD booklet archived online) on December 29, 2020. Retrieved February 7, 2019.
Ruhlmann, William James (1991). Chicago Group Portrait (Box Set)(CD booklet archived online) (Media notes). New York City, NY: Columbia Records. p. 6. Archived from the original on November 12, 2017. Retrieved February 7, 2019.