A. Jabeen, K. Naeem, Z. Ahmed, and N. Siddique, “Effect of Antigen Source on the Sensitivity of Avian Influenza Virus Haemagglutination Inhibition Test”, Int. J. Poult. Sci., vol. 9, no. 1, pp. 28–31, Dec. 2009, doi: 10.3923/ijps.2010.28.31.