APA (7 ম সংস্করণ) উদ্ধৃতি

Iowa. State Planning Board. Soil Conservation Committee. (1938). Soil conservation districts for Iowa? Iowa State Planning Board.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Iowa. State Planning Board. Soil Conservation Committee. Soil Conservation Districts for Iowa? [Des Moines]: Iowa State Planning Board, 1938.

M.L.A (8 ম সংস্করণ) উদ্ধৃতি

Iowa. State Planning Board. Soil Conservation Committee. Soil Conservation Districts for Iowa? Iowa State Planning Board, 1938.