Παραπομπή APA

(1939). Food and life: Yearbook of agriculture 1939. Washington: United States Department of Agriculture.

Παραπομπή Chicago Style

Food and Life: Yearbook of Agriculture 1939. Washington: United States Department of Agriculture, 1939.

Παραπομπή MLA

Food and Life: Yearbook of Agriculture 1939. Washington: United States Department of Agriculture, 1939.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.