K. Sayuti, R. Yenrina, and T. Anggraini, “Characteristics of ‘Kolang-kaling’ (Sugar Palm Fruit Jam) with Added Natural Colorants”, Pak. J. Nutr., vol. 16, no. 2, pp. 69–76, Jan. 2017, doi: 10.3923/pjn.2017.69.76.