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Hartnagle-Taylor and Taylor, Jeanne Joy and Ty (2010). Stockdog Savvy. Alpine Publications. ISBN 10:1-57779-106-1
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Willis, Malcolm; Bennett, Janet (1992). The German Shepherd Dog: A Genetic History. Maxwell Macmillan International. ISBN0876051751. Chú thích sử dụng tham số |coauthors= bị phản đối (trợ giúp)
Willis, Malcolm (1976). The German Shepherd Dog: Its History, Development and Genetics. K and R Books. ISBN0903264153.
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