Ruhlmann, Willam James (1991). Chicago Group Portrait (Box Set) (Media notes). Columbia Records. p. 7. Archived from the original(CD booklet archived online) on February 13, 2016. Retrieved July 5, 2018.
Ruhlmann, William James (1991). Chicago Group Portrait (Box Set) (Media notes). New York City, NY: Columbia Records. p. 8. Archived from the original(CD booklet archived online) on March 28, 2019. Retrieved July 5, 2018.
Hogan, Christine (October 24, 1977). "A mellow Chicago". The Sydney Morning Herald. Sydney, Australia. p. 3, The SMH Monday Guide section. Archived from the original on July 5, 2018. Retrieved July 5, 2018 – via Newspapers.com.
Ruhlmann, Willam James (1991). Chicago Group Portrait (Box Set) (Media notes). Columbia Records. p. 7. Archived from the original(CD booklet archived online) on February 13, 2016. Retrieved July 5, 2018.
Jerome, Jim (October 16, 1978). "Chicago's 'Alive Again'!". PEOPLE.com. Archived from the original on April 4, 2019. Retrieved July 5, 2018.
Ruhlmann, William James (1991). Chicago Group Portrait (Box Set) (Media notes). New York City, NY: Columbia Records. p. 8. Archived from the original(CD booklet archived online) on March 28, 2019. Retrieved July 5, 2018.
Hogan, Christine (October 24, 1977). "A mellow Chicago". The Sydney Morning Herald. Sydney, Australia. p. 3, The SMH Monday Guide section. Archived from the original on July 5, 2018. Retrieved July 5, 2018 – via Newspapers.com.