Suharto, Djoko. “Solidaritas 6.0 Melampaui Jebakan Pendapatan Menengah: Apakah Ukurannya Hanya Pendapatan Per Kapita?”. Mesin 27, no. 2 (October 20, 2018): 33-39. Accessed October 16, 2025. https://journals.itb.ac.id/index.php/jtms/article/view/15278.