Research in Arabia, 1987 and 1992: visits to King Khalid and National Wildlife Research Centres (Saudi Arabia), Al Wabra Wildlife Farm (Qatar), Al-Areen Wildlife Park and Reserve (Bahrain) and Al Ain Zoo (United Arab Emirates). Downloaded on 29 December 2006 from "Fichier HTML". Archived from the original on October 16, 2006. Retrieved December 29, 2006.
Research in Arabia, 1987 and 1992: visits to King Khalid and National Wildlife Research Centres (Saudi Arabia), Al Wabra Wildlife Farm (Qatar), Al-Areen Wildlife Park and Reserve (Bahrain) and Al Ain Zoo (United Arab Emirates). Downloaded on 29 December 2006 from "Fichier HTML". Archived from the original on October 16, 2006. Retrieved December 29, 2006.