APA ציטוט

Knight, H. (1938). Soils and men: Yearbook of agriculture, 1938. Department of agriculture.

Chicago Edition Citation

Knight, H.G. Soils and Men: Yearbook of Agriculture, 1938. Uuited states: Department of agriculture, 1938.

ציטוט MLA

Knight, H.G. Soils and Men: Yearbook of Agriculture, 1938. Department of agriculture, 1938.