Bhattacharya, Haimanti, J. Cirillo, and D. Todt. “Universal Features in the Singing of Birds Uncovered by Comparative Research”. Our Nature 6, no. 1 (March 1, 2009): 1–14. Accessed May 10, 2024. https://www.nepjol.info/index.php/ON/article/view/1648.