Dunbar, Willis (February 17, 1948). Post Cereal Company (audio). Western Michigan at Work. Kalamazoo, Michigan: WKZO. OCLC1026388957. Retrieved December 17, 2019.
Dunbar, Willis (February 17, 1948). Post Cereal Company (audio). Western Michigan at Work. Kalamazoo, Michigan: WKZO. OCLC1026388957. Retrieved December 17, 2019.