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3. Morphometrics of Houbara Bustards Chlamydotis spp: Sexual Size Dimorphism, Seasonal Changes and Differences between Species
4. Johnsgard, P. A. (1991). Bustards, Hemipodes and Sandgrouse: Birds of Dry Places. Oxford University Press, Oxford, UK.
5. Collar, N. J. (1996). Family Otididae (bustards). In Handbook of the Birds of the World, Volume 3 (J. del Hoyo, A. Elliott, and J. Sargatal, Editors), Lynx Edicions, Barcelona, Spain. pp. 240‒273.