Sundar, K.S. Gopi. Flock size, density and habitat selection of four large waterbird species in an agricultural landscape in Uttar Pradesh, India: implications for management. Waterbirds. 2006, 29 (3): 365–374. JSTOR 4132592. doi:10.1675/1524-4695(2006)29[365:FSDAHS]2.0.CO;2.
Chaudhury, S.; Koli, V.K. Population status, habitat preference, and nesting characteristics of Black-headed Ibis Threskiornis melanocephalus Latham, 1790 in southern Rajasthan, India. Journal of Asia-Pacific Biodiversity. 2018, 11 (2): 223–228. doi:10.1016/j.japb.2018.01.013.
Sundar, K.S. Gopi. Flock size, density and habitat selection of four large waterbird species in an agricultural landscape in Uttar Pradesh, India: implications for management. Waterbirds. 2006, 29 (3): 365–374. JSTOR 4132592. doi:10.1675/1524-4695(2006)29[365:FSDAHS]2.0.CO;2.