Tham khảo Cừu_Ronaldsay

  1. ↑ Barbara Rischkowsky, D. Pilling (eds.) (2007). p. 138. List of breeds documented in the Global Databank for Animal Genetic Resources, annex to The State of the World's Animal Genetic Resources for Food and Agriculture. Rome: Food and Agriculture Organization of the United Nations. ISBN 9789251057629. Truy cập August 2017.
  2. ↑ Watchlist 2017–18. Stoneleigh Park, Warwickshire: Rare Breeds Survival Trust. Truy cập May 2017.
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