V. Porter

Pigs: A Handbook to the Breeds of the World

V. Porter, 1993 .

Mason's world encyclopedia of livestock breeds and breeding. Volume 1 and Volume 2.

S. Hall, D. Sponenberg, V. Porter, 2016 .

Goats of the World

V. Porter, 1996 .

Saving the breeds: A history of the Rare Breeds Survival Trust

Lawrence Alderson, Val Porter, V. Porter, 1994 .