United States. Department of Agriculture & Hayes, J. (1980). Cutting Energy Costs. U.S. Dept. of Agriculture : For sale by the Supt. of Docs., U.S. G.P.O..
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিUnited States. Department of Agriculture এবং Jack Hayes. Cutting Energy Costs. [Washington, D.C.]: U.S. Dept. of Agriculture : For sale by the Supt. of Docs., U.S. G.P.O., 1980.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিUnited States. Department of Agriculture এবং Jack Hayes. Cutting Energy Costs. U.S. Dept. of Agriculture : For sale by the Supt. of Docs., U.S. G.P.O., 1980.