Popy, N., M. Asaduzzaman, M. S. Miah, A. Siddika, M. A. Sufian, and M. M. Hossain. “Pathological Study on the Upper Respiratory Tract Infection of Chickens and Isolation, Identification of Causal Bacteria”. Bangladesh Veterinarian 28, no. 2 (May 21, 2012): 60–69. Accessed December 7, 2021. https://www.banglajol.info/index.php/BVET/article/view/10677.