Tham khảo Cừu_Soay

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  • "Sheep". Rare Breeds Watchlist. Rare Breeds Survival Trust. Truy cập 2011-12-11.
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  • Gulland, F. M. D., F. M. D. (1992). "The role of nematode parasites in Soay sheep (Ovis aries L.) mortality during a population crash.". Parasitology 105 (3): 493–503. doi:10.1017/S0031182000074679. PMID 1461688.
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