Lubis, Rio Elvandari, and Adolf Pieter Lontoh. 2016. “Manajemen Panen Kelapa Sawit (Elaeis Guineensis Jacq.) Di Kebun Adolina, Serdang Bedagai, Sumatera Utara”. Buletin Agrohorti 4 (2): 144-54. https://doi.org/10.29244/agrob.v4i2.15013.