APA (7th ed.) Citation

Petersen, P. C. a., (curator), I. S. U. S. C. a. U. A., & Newlon, M. C. (1984). Peter C. Petersen letter to Michael C. Newlon regarding fall birds sighted, November 30, 1984.

Chicago Style (17th ed.) Citation

Petersen, Peter C.et al, Iowa State University. Special Collections and University Archives (curator), and Michael C. Newlon. Peter C. Petersen Letter to Michael C. Newlon Regarding Fall Birds Sighted, November 30, 1984. 1984.

MLA (9th ed.) Citation

Petersen, Peter C.et al, et al. Peter C. Petersen Letter to Michael C. Newlon Regarding Fall Birds Sighted, November 30, 1984. 1984.