1. The genuine works of Hippocrates;F Hippocrates Adams,1849
2. Evidence for the consumption of the inedible: Who, what, when, where, and why.;SL Young,2007
3. Understanding geophagy in animals: standard procedures for sampling soils.;WC Mahaney;J Chem Ecol,2003
4. The ICD-10 classification of mental and behavioural disorders: clinical descriptions and diagnostic guidelines,1992