PERERA, D.G.A. Kotagama, S.W. A Systematic nomenclature for the birds of Sri Lanka / [by] D.G.A.Perera, S.W.Kotagama - Dehiwala Field Ornithology Group of Sri Lanka Tisara Prakasakayo Ltd. 1983 - 107 p. Dewey Class. No.: 598.295493 / PER