Yenrina, R., Sayuti, K. and Anggraini, T. (2016) “Effect of Natural Colorants on Color and Antioxidant Activity of ‘Kolang Kaling’ (Sugar Palm Fruit) Jam”, Pakistan Journal of Nutrition, 15(12), pp. 1061–1066. doi:10.3923/pjn.2016.1061.1066.