J. Purba, D. . Napitupulu, and Y. . Damayanti, “COMPARATIVE ANALYSIS OF PADDY AND OIL PALM FARM INCOME IN TANJUNG JABUNG TIMUR REGENCY”, jma, vol. 16, no. 3, p. 194, Nov. 2019, doi: 10.17358/jma.16.3.194.