Krithiga, K., S. S. Devi, Surya Shankar, P. S. Reshma, M. J. Abraham, and Divakaran Nair. 2019. “Concurrent Infection of Infectious Bronchitis (IB) and Sub-Clinical Infectious Bursal Disease (IBD) in an Organised Poultry Farm”. International Journal of Livestock Research 9 (7). India:261-66. http://ijlr.org/ojs_journal/index.php/ijlr/article/view/1209.