Tham khảo Cừu

Tham khảo Cừu_Polypay

Alberta Sheep Breeders' Association - Polypay
"Polypay". Sheep Breeds - O-P. Sheep101.info. Truy cập 2009-03-20.
"Polypay". Sheep Breeds. Oklahoma State University, Dept. of Animal Science. Truy cập 2009-03-20.
Budiansky, Stephen (1999). The Covenant of the Wild: Why animals chose domestication. Yale University Press. ISBN 0-300-07993-1.
Ensminger, Dr. M.E.; Dr. R.O. Parker (1986). Sheep and Goat Science, Fifth Edition. Danville, Illinois: The Interstate Printers and Publishers Inc. ISBN 0-8134-2464-X.
Pugh, David G. (2001). Sheep & Goat Medicine. Elsevier Health Sciences. ISBN 0-7216-9052-1.
Simmons, Paula; Carol Ekarius (2001). Storey's Guide to Raising Sheep. North Adams, MA: Storey Publishing LLC. ISBN 978-1-58017-262-2.
Smith M.S., Barbara; Mark Aseltine PhD; Gerald Kennedy DVM (1997). Beginning Shepherd's Manual, Second Edition. Ames, Iowa: Iowa State University Press. ISBN 0-8138-2799-X.
Weaver, Sue (2005). Sheep: small-scale sheep keeping for pleasure and profit. 3 Burroughs Irvine, CA 92618: Hobby Farm Press, an imprint of BowTie Press, a division of BowTie Inc. ISBN 1-931993-49-1.Quản lý CS1: địa điểm (liên kết)
Wooster, Chuck (2005). Living with Sheep: Everything You Need to Know to Raise Your Own Flock. Geoff Hansen (Photography). Guilford, Connecticut: The Lyons Press. ISBN 1-59228-531-7.

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