Narang, Asmita, et al. “Sero-Positivity of Bovine Herpes Virus Type 1, Parainfluenza Type 3 Virus and Respiratory Syncytial Virus in Healthy and Pneumonic Cattle”. International Journal of Livestock Research, vol. 10, no. 12, Dec. 2020, pp. 45-50, doi:10.5455/ijlr.20200713051224.