PradanaAlfa Nugraha, dan Julio Adisantoso. 2013. “Development of Programming Learning Management System for Scheme, Java, PHP, and Perl Language”. Jurnal Ilmu Komputer Dan Agri-Informatika 2 (2). Bogor, ID, 47-54. https://doi.org/10.29244/jika.2.2.47-54.