M. Islam, M. Samad, and M. Rahman, “Evaluation of Alum Precipitated Formalin Killed Fowl Cholera Vaccines with Their Immunologic Responses in Ducks”, Int. J. Poult. Sci., vol. 3, no. 2, pp. 140–143, Jan. 2004, doi: 10.3923/ijps.2004.140.143.