Não informado. (1956). National Hog Farmer. National Swine Growers Center.
Style de citation Chicago (17e éd.)Não informado. National Hog Farmer. MGrundy Center, Ohio: National Swine Growers Center, 1956.
Style de citation MLA (8e éd.)Não informado. National Hog Farmer. National Swine Growers Center, 1956.
Attention : ces citations peuvent ne pas être correctes à 100%.