United States. Extension Service & United States. Federal Extension Service. (1930). Extension service review / issued monthly by the Extension Service, United States Department of Agriculture. Extension Service: For sale by the Supt. of Docs..
Chicago Style (17. basım) AtıfUnited States. Extension Service ve United States. Federal Extension Service. Extension Service Review / Issued Monthly by the Extension Service, United States Department of Agriculture. Washington, D.C.: Extension Service: For sale by the Supt. of Docs., 1930.
MLA (9th ed.) AtıfUnited States. Extension Service ve United States. Federal Extension Service. Extension Service Review / Issued Monthly by the Extension Service, United States Department of Agriculture. Extension Service: For sale by the Supt. of Docs., 1930.