Andrews, John S., et al. “PRELIMINARY NOTE ON THE ADMINISTRATION OF NON-CONDITIONED PHENOTHIAZINE, IN SMALL DAILY DOSES, FOR THE CONTROL OF GASTROINTESTINAL PARASITES OF CATTLE IN PUERTO RICO”. The Journal of Agriculture of the University of Puerto Rico, vol. 27, no. 3, July 1943, pp. 125-30, doi:10.46429/jaupr.v27i3.12886.