Парнопрсти копитари — разлика између измена

* {{Cite book |ref= harv|author= Savage, R. J. G. & Long, M. R.|year=1986 |title= Mammal Evolution: an illustrated guide|publisher= Facts on File|location=New York|pages= 208|isbn= 0-8160-1194-X| ref = harv}}

* {{Cite book |ref= harv|author=Pough, F. W., Janis, C. M. & Heiser, J. B. |title=Vertebrate Life |chapter=Major Lineages of Mammals |year=2005 |origyear=1979 |edition=7th edition |publisher= Pearson |pages=539 |isbn=0-13-127836-3| ref = harv}}

* {{Cite book |ref= harv|author=McKenna, M. C. & Bell, S. K. |year=1997 |title=Classification of Mammals Above the Species Level |publisher=Columbia University Press |location=New York |isbn=0-231-11013-8| ref = harv}}

* {{Cite book |ref= harv|editor=Wilson, D. E. & Reeder, D. M. |title=Mammal Species of the World |edition=3rd edition |publisher=Johns Hopkins University Press |pages=111–184 |isbn=0-801-88221-4| ref = harv}}