Grimmett, R, C Inskipp, and T Inskipp. 2012. Birds of India, Pakistan, Nepal, Bangladesh, Bhutan, Sri Lanka, and The Maldives, second edition. Princeton, NJ, USA: Princeton University Press. ISBN 978-0691153490
Grimmett, R, C Inskipp, and T Inskipp. 2012. Birds of India, Pakistan, Nepal, Bangladesh, Bhutan, Sri Lanka, and The Maldives, second edition. Princeton, NJ, USA: Princeton University Press. ISBN 978-0691153490