Wanodyanti, Niken Dyah, Idqan Fahmi, and Agus Maulana. “Customer Development Model Dalam Bisnis Jasa Pembelajaran Program English As Second Languange (ESL)”. Jurnal Aplikasi Bisnis dan Manajemen 5, no. 1 (January 24, 2019): 95. Accessed December 24, 2025. https://journal.ipb.ac.id/jabm/article/view/24554.