1. Subdivisions of the genus Ptilinopus (Aves, Columbae);Cain;Bull. Br. Mus. Nat. Hist. (Zool.),1954
2. Carr , H A. 1919 The behaviour of pigeons; posthumous works of Charles Otis Whitman
3. Davies , S. J. J. F. 1965 Studies of the behaviour of certain Streptopelia doves and their hybrids Ph.D. thesis University of Cambridge
4. Patterns of inheritance in the bowing display and associated behaviour of some hybrid Streptopelia doves;Davies;Behaviour,1970