FAHMY, M.H. and MASON, I.L. Newly developed prolific breeds. In: Prolific Sheep, M.H. Fahmy (Ed.), CAB International, UK .pp 187-203.
Porter, V., Alderson, L., Hall, S. J. G., & Sponenberg, D. P. (2016). Mason’s World Encyclopedia of Livestock Breeds and Breeding: 2 Volume Pack (1st ed.). Wallingford, Oxfordshire, UK: CABI.