I.: Woodcock, Martin: Collins Handguide to the Birds of the Indian Sub – Continent. London, Collins 1990. OKart. ISBN 000219712X / II.: Ali, Salim: Field Guide to the Birds of the Eastern Himalayas. Delhi, Oxford Univ. Press 1986. OLn. m. OU. / III.: Viney, Clive; Phillipps, Karen: A Colour Guide to Hong Kong Birds. Hong Kong, Government Printer 1979. OKart. / IV.: Viney, Clive; Phillipps, Karen: New Colour Guide to Hong Kong Birds. Hong Kong, Government Printer 1983. OKart. Books in fine condition.