Birds of Bhutan
Ali, Salim, Biswas, B., Ripley, S. Dillon
Birds of Bhutan - Calcutta 1996 - 1-207 p. - Birds Calcutta Zoological Survey of India. Occasional No. 136 .
Birds of Bhutan - Calcutta 1996 - 1-207 p. - Birds Calcutta Zoological Survey of India. Occasional No. 136 .