References

BirdLife International (2010). Species factsheet: Otis tarda.

Cocker, M and Mabey, R (2005). Birds Britannica. Chatto and Windus, London.

Collar, N 1996. Family Otididae (Bustards). In: del Hoyo, J, Elliott, A and Sargatal, J (eds). Handbook of the Birds of the World, Volume 3, Hoatzin to Auks. Lynx Edicions, Barcelona: pp. 421–273.