Gideon Satria Putra Sugiyanto, and Agung Wicaksono. 2020. “MARKETING STRATEGY EVALUATION OF MRT JAKARTA’S MOBILE APPLICATION USING MARKETING 4.0 CONCEPT”. ADVANCED INTERNATIONAL JOURNAL OF BUSINESS, ENTREPRENEURSHIP AND SME’S (AIJBES) 2 (6):43-54. https://gaexcellence.com/aijbes/article/view/178.