Iowa State College. Agricultural Experiment Station & Iowa State College. Agricultural Extension Station. (1939). Bulletin P. Agricultural Experiment Station--Agricultural Extension Service, Iowa State College.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিIowa State College. Agricultural Experiment Station এবং Iowa State College. Agricultural Extension Station. Bulletin P. Ames, Iowa: Agricultural Experiment Station--Agricultural Extension Service, Iowa State College, 1939.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিIowa State College. Agricultural Experiment Station এবং Iowa State College. Agricultural Extension Station. Bulletin P. Agricultural Experiment Station--Agricultural Extension Service, Iowa State College, 1939.
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