Medlock, A.E. and Dailey, H.A. (1996). „Human coproporphyrinogen oxidase is not a metalloprotein”. J. Biol. Chem.271: 32507-32510. PMID8955072.
Kohno, H., Furukawa, T., Yoshinaga, T., Tokunaga, R. and Taketani, S. (1993). „Coproporphyrinogen oxidase. Purification, molecular cloning, and induction of mRNA during erythroid differentiation”. J. Biol. Chem.268: 21359-21363. PMID8407975.