Adiasih, P, A Charity Budiarso, C Natalia Sulangi, and E Valerin Petra. “Customers Income: Exploring Customers’ Willingness to Pay Toward Green-Rated Hotels”. KnE Social Sciences 3, no. 11 (March 24, 2019): 115–132. Accessed April 24, 2024. https://knepublishing.com/index.php/KnE-Social/article/view/4003.