Sarker, N. J., M. F. Jaman, S. Mustafa, and M. S. Rahman. “Breeding Biology of Coppersmith Barbet, Megalaima Haemacephala (Müller, 1776)”. University Journal of Zoology, Rajshahi University, vol. 31, June 2013, pp. 31-34, doi:10.3329/ujzru.v31i0.15397.