Zaibun Nisa Memon, G. S. Gachal, M. Yousuf, M. A K. Arian, A. H. Soomro and M. Khaskheli 2006. Incidence of Infectious Bronchitis Disease in and around Hyderabad. Sindh University Research Journal - SURJ (Science Series). 38, 2 (Dec. 2006).