APA (7th ed.) Citation

Petersen, P. C. a., (curator), I. S. U. S. C. a. U. A., Hahn, A. C., Graves, D., Petersen, M. L., Scott, C., & Zuurdeeg, W. (1980). Field notes contributed by Peter C. Petersen, spring 1980.

Chicago Style (17th ed.) Citation

Petersen, Peter C.et al, Iowa State University. Special Collections and University Archives (curator), Allan C. Hahn, Don Graves, Mary Lou Petersen, Clark Scott, and Walter Zuurdeeg. Field Notes Contributed by Peter C. Petersen, Spring 1980. 1980.

MLA (9th ed.) Citation

Petersen, Peter C.et al, et al. Field Notes Contributed by Peter C. Petersen, Spring 1980. 1980.