Purwaningrum, Y., J. Napitupulu, T. Siregar, and C. Hanum. “Histology and Physiology of BPM1 Clones With Different Exploitation Systems”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 21, no. 1, Mar. 2015, pp. 138-4, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/3600.