Shobrak, Mohammed. “Changes in the Number of Breeding Pairs, Nest Distribution and Nesting Trees Used by the Lappet-Faced Vulture <i>Torgos tracheliotus< i> In the Mahazat As-Sayd Protected Area, Saudi Arabia”. Journal of the Bombay Natural History Society (JBNHS), vol. 108, no. 2, Aug. 2011, pp. 114-9, https://www.bnhsjournal.in/index.php/bnhs/article/view/156523.