Παραπομπή σε μορφή APA (7η εκδ.)

Iowa State College. Agricultural Experiment Station & Iowa State College. Agricultural Extension Station. (1939). Bulletin P. Agricultural Experiment Station--Agricultural Extension Service, Iowa State College.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Iowa State College. Agricultural Experiment Station και Iowa State College. Agricultural Extension Station. Bulletin P. Ames, Iowa: Agricultural Experiment Station--Agricultural Extension Service, Iowa State College, 1939.

Παραπομπή σε μορφή MLA (8th εκδ.)

Iowa State College. Agricultural Experiment Station και Iowa State College. Agricultural Extension Station. Bulletin P. Agricultural Experiment Station--Agricultural Extension Service, Iowa State College, 1939.