APA (7th ed.) Citation

Gruenewald, R. a., (curator), I. S. U. S. C. a. U. A., & Kent, T. H. (1998). Robert Gruenewald letter to Thomas H. Kent regarding details on fall bird sightings, December 7, 1998.

Chicago Style (17th ed.) Citation

Gruenewald, Robertet al, Iowa State University. Special Collections and University Archives (curator), and Thomas H. Kent. Robert Gruenewald Letter to Thomas H. Kent Regarding Details on Fall Bird Sightings, December 7, 1998. 1998.

MLA (9th ed.) Citation

Gruenewald, Robertet al, et al. Robert Gruenewald Letter to Thomas H. Kent Regarding Details on Fall Bird Sightings, December 7, 1998. 1998.