Cuban land snails". Zoosystematics and Evolution 84(2): 265-310. doi:10.1002/zoos.200800011. Richling I. (2009). "The Radiation of the Helicinidae in New Caledonia
S. Anoop 2006 Record of Nasikabatrachus from the Northern Western Ghats. Zoos' Print Journal 21(9):2410 PDF (页面存档备份,存于互联网档案馆) Radhakrishnan, C; K.C. Gopi
OCLC 62265494. OL 3392515M. NLC 001238428. Article - World Association of Zoos and Aquariums (WAZA), Virtual Zoo". [2009-02-22]. (Lion-tailed Macaque 原始内容
Dollinger, Peter and Silvia Geser. Black Rhinoceros. World Association of Zoos and Aquariums. [9 October 2007]. (原始内容存档于2009-07-16). Bhaumik, Subir. Assam