Iowa State College. Agricultural Experiment Station & Iowa State College. Agricultural Extension Station. (1939). Bulletin P. Agricultural Experiment Station--Agricultural Extension Service, Iowa State College.
Citação do estilo Chicago (17ª ed.)Iowa State College. Agricultural Experiment Station e Iowa State College. Agricultural Extension Station. Bulletin P. Ames, Iowa: Agricultural Experiment Station--Agricultural Extension Service, Iowa State College, 1939.
Citação MLA (8ª ed.)Iowa State College. Agricultural Experiment Station e Iowa State College. Agricultural Extension Station. Bulletin P. Agricultural Experiment Station--Agricultural Extension Service, Iowa State College, 1939.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.