du Plessis, J. L., Potgieter, F. T., & van Gas, L. (1990). An attempt to improve the immunization of sheep against heart-water by using different combinations of 3 stocks of Cowdria ruminantium. Onderstepoort journal of veterinary research, 57(3), 205.
Citace podle Chicago (17th ed.)du Plessis, J L., F T. Potgieter, a L. van Gas. "An Attempt to Improve the Immunization of Sheep Against Heart-water by Using Different Combinations of 3 Stocks of Cowdria Ruminantium." Onderstepoort Journal of Veterinary Research 57, no. 3 (1990): 205.
Citace podle MLA (9th ed.)du Plessis, J L., et al. "An Attempt to Improve the Immunization of Sheep Against Heart-water by Using Different Combinations of 3 Stocks of Cowdria Ruminantium." Onderstepoort Journal of Veterinary Research, vol. 57, no. 3, 1990, p. 205.