Citazione Stile APA (7a Edizione)

United States. Dept. of Agriculture. (1948). Grass: The yearbook of agriculture 1948. United States Department of Agriculture.

Citazione stile Chigago Style (17a edizione)

United States. Dept. of Agriculture. Grass: The Yearbook of Agriculture 1948. Washington, D.C.: United States Department of Agriculture, 1948.

Citatione MLA (8a ed.)

United States. Dept. of Agriculture. Grass: The Yearbook of Agriculture 1948. United States Department of Agriculture, 1948.