Malau, Sabam, Albiner Siagian, Bilter Sirait, Himsar Ambarita, Maria Rumondang Sihotang, and Benika Naibaho. “Research on Plant Growth of Genotypes of Arabica Coffee on Water Stress”. Advanced Aspects of Engineering Research Vol. 5 (May 7, 2021): 55–64. Accessed June 4, 2026. https://stm.bookpi.org/AAER-V5/article/view/985.