Ali, S., & Ripley, S. D. (1969). Handbook of the birds of India and Pakistan: Together with those of Nepal, Sikkim, Bhutan and Ceylon. Oxford University Press.

Ali, Salim, and S. Dillon Ripley. Handbook of the Birds of India and Pakistan: Together with Those of Nepal, Sikkim, Bhutan and Ceylon. Bombay: Oxford University Press, 1969.

Ali, Salim, and S. Dillon Ripley. Handbook of the Birds of India and Pakistan: Together with Those of Nepal, Sikkim, Bhutan and Ceylon. Oxford University Press, 1969.