T. Liana, E. C. Prima, P. Sinaga, and R. Riandi, “Production of Biosurfactant from Frangipani Flower Extract (Plumeria rubra) as an Eco-friendly Detergent in a Science Learning Project”, J. Sc. Edu. Research, vol. 7, no. 1, pp. 27–38, Apr. 2023.