“A Comparison of Serological Responses When Modified-Live Infectious Bovine Rhinotracheitis Virus Vaccine, Mannheimia Haemolytica Bacterin-Toxoid and Leptospira Pomona Bacterin Are Administered With Needle-Free Versus Conventional Needle-Based Injection in Holstein Dairy Calves”. The Bovine Practitioner, vol. 39, no. 2, June 2005, pp. 110-4, https://doi.org/10.21423/bovine-vol39no2p110-114.