R. E. Lubis and A. P. Lontoh, “Manajemen Panen Kelapa Sawit (Elaeis guineensis Jacq.) di Kebun Adolina, Serdang Bedagai, Sumatera Utara”, Bul. Agrohorti, vol. 4, no. 2, pp. 144–154, May 2016, doi: 10.29244/agrob.v4i2.15013.