1. Codex Alimentarius Standard 1981 General standard for the labeling of food additives www.codexalimentarius.net/download/standards/2/CXS_107e.pdf
2. Goldberg Y. 2012 The primary ingredients in detergents http://oukosher.org/index.php/common/article/the_primary_ingredients_in_detergents/Surfactants
3. Halal Consumer Group 2012 http://www.muslimconsumergroup.com