1. Abdel-Fattah, A., & Pingitore, N. E. (2009). Low levels of toxic elements in Dead Sea black mud and mud-derived cosmetic products. Environmental Geochemistry and Health, 31, 487–492.
2. Adal, A., Tarabar, A., 2013. Heavy metal toxicity. http://emedicine.medscape.com/article/814960-overview .
3. Adepoju-Bello, A. A., Oguntibeju, O. O., Adebisi, R. A., Okpala, N., & Coker, H. A. B. (2012). Evaluation of the concentration of toxic metals in cosmetic products in Nigeria. African Journal of Biotechnology, 11, 16360–16364.
4. Al-Dayel, O., Hefne, J., & Al-Ajyan, T. (2011). Human exposure to heavy metals from cosmetics. Oriental Journal of Chemistry, 27, 1–11.
5. Al-Qutob, M. A., Alatrash, H. M., & Abol-Ola, S. (2013). Determination of different heavy metals concentrations in cosmetics purchased from the Palestinian markets by ICP/MS. AES Bioflux, 5, 287–293.