APA (7th ed.) Citation

WKZO (Radio station : Kalamazoo, Mich.), Dunbar, W. F., & Bertholet, B. E. Western Michigan at work.

Chicago Style (17th ed.) Citation

WKZO (Radio station : Kalamazoo, Mich.), Willis Frederick Dunbar, and B. E. Bertholet. Western Michigan at Work.

MLA (9th ed.) Citation

WKZO (Radio station : Kalamazoo, Mich.), et al. Western Michigan at Work.