Não informado. (1956). National Hog Farmer. National Swine Growers Center.
Chicagoスタイル(17版)引用形式Não informado. National Hog Farmer. MGrundy Center, Ohio: National Swine Growers Center, 1956.
MLA(8版)引用形式Não informado. National Hog Farmer. National Swine Growers Center, 1956.
警告: この引用は必ずしも正確ではありません.