APA (7th ed.) Citation

Petersen, P. C. a., (curator), I. S. U. S. C. a. U. A., & Kent, T. H. (1980). Peter C. Peterson letter to Thomas Kent regarding Vireo and Warbler accounts and Fall birds sighted, November 30, 1980.

Chicago Style (17th ed.) Citation

Petersen, Peter C.et al, Iowa State University. Special Collections and University Archives (curator), and Thomas H. Kent. Peter C. Peterson Letter to Thomas Kent Regarding Vireo and Warbler Accounts and Fall Birds Sighted, November 30, 1980. 1980.

MLA (9th ed.) Citation

Petersen, Peter C.et al, et al. Peter C. Peterson Letter to Thomas Kent Regarding Vireo and Warbler Accounts and Fall Birds Sighted, November 30, 1980. 1980.