Stewart J. L., Shipley C. F., Ireland F. A., Felix T. L., Jarrell V. L., Jimenez Poveda S. C., and Shikeb D. W. “Effects Of Different Applications Of Pyrethrins And Cyfluthrin, A Synthetic Pyrethroid, On Bull Reproductive Parameters”. Clinical Theriogenology, vol. 7, no. 1, Mar. 2015, pp. 27-34, https://clinicaltheriogenology.net/index.php/CT/article/view/10089.