Di Maio, M.C., Caruso, D. (1991): Preliminary note on two north African species of the genus Porcellio : P. olivieri Aud.- Say. and P. letourneuxi Sim. (Crustacea, Oniscidea). In: Juchault, P., Mocquard, J. (eds.): The Biology of Terrestrial Isopods III. Proceedings of the Third International Symposium on the Biology of Terrestrial Isopods. Poitiers: 31-32. (viz sborník v PDF)