APA (7e ed.) Bronvermelding

Não informado. (1956). National Hog Farmer. National Swine Growers Center.

Chicago (17e ed.) Bronvermelding

Não informado. National Hog Farmer. MGrundy Center, Ohio: National Swine Growers Center, 1956.

MLA (8e ed.) Bronvermelding

Não informado. National Hog Farmer. National Swine Growers Center, 1956.

Let op: Deze citaties zijn niet altijd 100% accuraat.