Iowa Agricultural College. Agricultural Experiment Station. (1888). Bulletin. Agricultural Experiment Station at the State Agricultural College.
Chicago-referens (17:e uppl.)Iowa Agricultural College. Agricultural Experiment Station. Bulletin. Ames, Iowa: Agricultural Experiment Station at the State Agricultural College, 1888.
MLA-referens (8:e uppl.)Iowa Agricultural College. Agricultural Experiment Station. Bulletin. Agricultural Experiment Station at the State Agricultural College, 1888.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.