Não informado. Polled Hereford World. American Polled Hereford Association.
Citace podle Chicago (17th ed.)Não informado. Polled Hereford World. Kansas City, Kan: American Polled Hereford Association.
Citace podle MLA (8th ed.)Não informado. Polled Hereford World. American Polled Hereford Association.
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