^ abPorter, Valerie (2020-05-26). Mason's World Dictionary of Livestock Breeds, Types and Varieties, 6th Edition. CABI. p. 209. ISBN 978-1-78924-153-2.
^Rousseau, Élise (2017-05-09). Horses of the World. Princeton University Press. p. 536. ISBN 978-0-691-16720-6.