Pandiangan, D. (2011). Perubahan Morfologi dan Anatomi Kalus Catharanthus roseus dengan Perlakuan Triptofan (The morphological and anatomical changes on tryptophan-treated callus of Catharanthus roseus). JURNAL BIOS LOGOS, 2(1). https://doi.org/10.35799/jbl.2.1.2012.379