Nicko Gana Saputra, and Asep Parantika. 2017. “Analisa Ability To Pay (ATP) Dan Willingness To Pay (WTP) Pengunjung Di Monumen Nasional Jakarta”. Jurnal Sains Terapan Pariwisata 2 (2):129-45. https://journal.polteksahid.ac.id/index.php/jstp/article/view/45.