APA (7th ed.) Citation

Petersen, P. C. a., (curator), I. S. U. S. C. a. U. A., Blevins, B. L., Lesher, F., McKay, K., & Zuurdeeg, W. (1997). Field notes contributed by Peter C. Petersen, spring 1997.

Chicago Style (17th ed.) Citation

Petersen, Peter C.et al, Iowa State University. Special Collections and University Archives (curator), Brian L. Blevins, Fred Lesher, Kelly McKay, and Walter Zuurdeeg. Field Notes Contributed by Peter C. Petersen, Spring 1997. 1997.

MLA (9th ed.) Citation

Petersen, Peter C.et al, et al. Field Notes Contributed by Peter C. Petersen, Spring 1997. 1997.