American Shropshire Registry Assn, Levering, M., & Wad, J. M. (1889). The American Shropshire sheep record. American Shropshire Registry Association.
Citace podle Chicago (17th ed.)American Shropshire Registry Assn, Mortimer Levering, a Julia M. Wad. The American Shropshire Sheep Record. [S.l.]: American Shropshire Registry Association, 1889.
Citace podle MLA (8th ed.)American Shropshire Registry Assn, et al. The American Shropshire Sheep Record. American Shropshire Registry Association, 1889.
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