Sebayang, L. 2015. ASSESSMENT OF COMMODITIES AREA GAMBIER (Uncaria gambir Roxb.) IN PAKPAK BHARAT SCALE 1 : 50.000. Jurnal Online PERTANIAN TROPIK. 2, 2 (Aug. 2015), 102-109`. DOI:https://doi.org/10.32734/jpt.v2i2.2890.