Kunkel, J. R., W. M. Murphy, D. Rogers, and D. T. Dugdale, Jr. 1983. “Seasonal Control of Gastrointestinal Parasites Among Dairy Heifers Using Two Strategically Timed Treatments of Fenbendazole”. The Bovine Practitioner 1983 (18):54-57. https://doi.org/10.21423/bovine-vol1983no18p54-57.