Lapian, Stanss Levynna Hermien Verronica Joyce, and Altje Tumbel. 2019. “Analysis of Green Marketing Mix Factors On Hotel Industry (Study on Sintesa Peninsula Hotel Manado; Discovery Kartika Plaza Denpasar; Hyatt Regency Yogyakarta; Grand Melia Jakarta)”. International Review of Management and Marketing 8 (6):112-21. https://www.econjournals.com/index.php/irmm/article/view/7116.