(原始内容存档于2021-03-09). Online petfood sales poised for significant growth?. [2017-09-15]. (原始内容存档于2020-12-05). Research, Zion Market. U.S. PetFood Market will reach
Alternet article on vegan cat food(英文) Vegan PetFood: A Discussion Animal Voices audio interview with Evolution petfood CEO(英文) From Max's House (页面存档备份,存于互联网档案馆)