Ismail, A. et al. 2018. Carotenoid Content and Retinol Activity Equivalents (RAE) of Seven Varieties of Mas Cotek (Ficus deltoidea) Leaf Extracts. International Journal of Engineering & Technology. 7, 4.43 (Dec. 2018), 158–163. DOI:https://doi.org/10.14419/ijet.v7i4.43.25840.