Παραπομπή APA

(1938). Soils & men. [United States]: United States Department of Agriculture.

Παραπομπή Chicago Style

Soils & Men. [United States]: United States Department of Agriculture, 1938.

Παραπομπή MLA

Soils & Men. [United States]: United States Department of Agriculture, 1938.

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