Janzen, Eugene D. “The Role of Haemophilus Somnus in Bovine Respiratory Disease (BRD)”. The Bovine Practitioner 1997, no. 31.1 (January 1, 1997): 39–45. Accessed November 9, 2024. https://bovine-ojs-tamu.tdl.org/bovine/article/view/1493.