Não informado. (2002). Purebred picture. American Berkshire Association.
Chicagoスタイル(17版)引用形式Não informado. Purebred Picture. West Lafayette, Ind: American Berkshire Association, 2002.
MLA(8版)引用形式Não informado. Purebred Picture. American Berkshire Association, 2002.
警告: この引用は必ずしも正確ではありません.