1. Abebe, Y., Bogale, A., Hambidge, K. M., Stoecker, B. J., Bailey, K., & Gibson, R. S. (2007). Phytate, zinc, iron and calcium content of selected raw and prepared foods consumed in rural Sidama, Southern Ethiopia, and implications for bioavailability. Journal of Food Composition and Analysis, 20(3–4), 161–168.
2. Abrahams, P. W. (2005). Geophagy and the involuntary ingestion of soils. In O. Selinus, B. Alloway, J. A. Centeno, R. B. Finkleman, R. Fuge, U. Lindh & P. Smedley (Eds.), Essentials of medical geology: Impacts of the natural environment on public health (pp. 435–458). Burlington, MA: Elsevier Academic.
3. Abrahams, P. W., & Parsons, J. A. (1996). Geophagy in the tropics: A literature review. The Geographical Journal, 162(1), 63–72.
4. Abrahams, P. W., & Parsons, J. A. (1997). Geophagy in the tropics: An appraisal of three geophagical materials. Environmental Geochemistry and Health, 19, 19–22.
5. Atkins, J., & Crowe, M. (2006). Interdisciplinary Research: Diverse approaches in Science Technology, Health & Society, Wiley, ISBN: 1-86156-470-8. p. 250.