http://puslitbangnak.blogspot.com/2013_03_01_archive.html
http://www.deptan.go.id/infoeksekutif/nak/isi_dt5thn_nak.php
http://katalog.pdii.lipi.go.id/opac
http://peternakan.fp.unib.ac.id/?page_id=104
http://peternakan.litbang.deptan.go.id/index.php?option=com_content&view=article&id=3633&Itemid=119