Purwaningrum, Y., Asbur, Y. ., Kusbiantoro, D. ., & Khairunisyah. (2021). Effect of Length and Up Ward Tapping on Physiology and Latex Yield on Rubber Plants RRIM 921. Jurnal Online Pertanian Tropik, 8(1), 59-66. https://doi.org/10.32734/jopt.v8i1.6311