Arja, A.R. and Supijatno, . 2018. Penyadapan Tanaman Karet (Hevea brasiliensis Mull-Arg.) di Perkebunan Karet Gurach Batu Estate, Asahan, Sumatera Utara. Buletin Agrohorti. 6, 1 (Jan. 2018), 1–9. DOI:https://doi.org/10.29244/agrob.v6i1.16817.