Garris, G.I. and George, J.E. 1983. Efficacy of Crotoxyphos Sprays for the Control of the Southern Cattle Tick in Puerto Rico. The Journal of Agriculture of the University of Puerto Rico. 67, 3 (Jul. 1983), 256–261. DOI:https://doi.org/10.46429/jaupr.v67i3.7717.