Janya Vechpanich และ Artiwan Shotipruk. (2008) Extraction and purification of lutein fatty acid esters from marigold flower. Chulalongkorn University:ม.ป.ท.Janya Vechpanich และ Artiwan Shotipruk. 2008. Extraction and purification of lutein fatty acid esters from marigold flower. ม.ป.ท.:Chulalongkorn University;Janya Vechpanich และ Artiwan Shotipruk. Extraction and purification of lutein fatty acid esters from marigold flower. ม.ป.ท.:Chulalongkorn University, 2008. Print.