du Plessis, J. L., & Bezuidenhout, J. D. (1979). Investigations on the natural and acquired resistance of cattle to artificial infection with Cowdria ruminantium. Journal of the South African Veterinary Association, 50(4), 334. https://doi.org/10.10520/AJA00382809_3601
Citácia podle Chicago (17th ed.)du Plessis, J L., a J D. Bezuidenhout. "Investigations on the Natural and Acquired Resistance of Cattle to Artificial Infection with Cowdria Ruminantium." Journal of the South African Veterinary Association 50, no. 4 (1979): 334. https://doi.org/10.10520/AJA00382809_3601.
Citácia podľa MLA (8th ed.)du Plessis, J L., a J D. Bezuidenhout. "Investigations on the Natural and Acquired Resistance of Cattle to Artificial Infection with Cowdria Ruminantium." Journal of the South African Veterinary Association, vol. 50, no. 4, 1979, p. 334, https://doi.org/10.10520/AJA00382809_3601.