M. Chowdhury, A. Ashraf, S. Mondal, N. M. A. A. M. Mondol, and M. Hasan, “Effect of Season on the Hatchability of Duck Eggs”, Int. J. Poult. Sci., vol. 3, no. 6, pp. 419–421, May 2004, doi: 10.3923/ijps.2004.419.421.