Sanjib Upadhyaya, and S. PK. “Study on Display Sequences in Cotton Pygmy-Goose Nettapus Coromandelianus Coromandelianus Gmelin”. Journal of Research in Biology, Vol. 1, no. 5, Sept. 2011, pp. 341-5, https://ojs.jresearchbiology.com/index.php/jrb/article/view/103.