Prameswari, W., Anandyawati, A., Prasetyo, P., Salamah, U., Oktavia, D., and Setyowati, N., “Natural plant growth regulator effect on the vegetative growth of Long Pepper (Piper retrofractum Vahl.)”, Int. J. Agric. Tech., vol. 18, no. 3, pp. 1167–1178, May 2022.