APA (7th ed.) Citation

Petersen, P. C. a., & (curator), I. S. U. S. C. a. U. A. (1993). Notes on birds observed on May 11 big day.

Chicago Style (17th ed.) Citation

Petersen, Peter C.et al, and Iowa State University. Special Collections and University Archives (curator). Notes on Birds Observed on May 11 Big Day. 1993.

MLA (9th ed.) Citation

Petersen, Peter C.et al, and Iowa State University. Special Collections and University Archives (curator). Notes on Birds Observed on May 11 Big Day. 1993.

Warning: These citations may not always be 100% accurate.