Green, R. A., A. W. Monlux, and T. C. Randolph. “Blood Porphyrin Determination: A rapid Field Test for Lead Poisoning in Cattle”. The Bovine Practitioner 1973, no. 8 (November 1, 1973): 30–35. Accessed July 14, 2024. https://bovine-ojs-tamu.tdl.org/bovine/article/view/1820.