Wardiah, Nurilda. “Pengembangan Produk Baru Dan Model-Model Evaluasi Produk Baru”. Jurnal Manajemen Maranatha 2, no. 2 (February 10, 2015): 93–112. Accessed April 24, 2024. https://journal.maranatha.edu/index.php/jmm/article/view/125.