APA (7th ed.) Citation

Hansen, J. L. a., (curator), I. S. U. S. C. a. U. A., & Kent, T. H. (1980). James L. Hansen letter to Thomas Kent regarding birds sighted by himself and others, November 25, 1980.

Chicago Style (17th ed.) Citation

Hansen, James L.et al, Iowa State University. Special Collections and University Archives (curator), and Thomas H. Kent. James L. Hansen Letter to Thomas Kent Regarding Birds Sighted by Himself and Others, November 25, 1980. 1980.

MLA (9th ed.) Citation

Hansen, James L.et al, et al. James L. Hansen Letter to Thomas Kent Regarding Birds Sighted by Himself and Others, November 25, 1980. 1980.