Ismail, Muhamad, and . Supijatno. “Penyadapan Tanaman Karet (Hevea Brasiliensis Muell Arg.) Di Kebun Sumber Tengah, Jember, Jawa Timur”. Buletin Agrohorti, vol. 4, no. 3, Dec. 2016, pp. 256-65, https://doi.org/10.29244/agrob.v4i3.14241.