Cite journal Last name Ziegler, J. Year of publication 1997 Title Geophagia: a vestige of paleonutrition? Journal Tropical Medicine and International Health Publisher Tropical Medicine and International Health Volume 2 Issue 7 Pages 609–611 DOI 10.1046/j.1365-3156.1997.d01-359.x PMID 9270727 ↑ Abrahams PW (2003). "Human Geophagy: A Review of Its Distribution, Causes, and Implications".