Pandiangan, Dingse. “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, no. 1 (February 1, 2011). Accessed November 22, 2024. https://ejournal.unsrat.ac.id/v3/index.php/bioslogos/article/view/379.