Thaworn, Wipawan, Kemika SanSom, and Kittichai Jaroenchai. 2020. “Marketing Mix’s and Customer Relationship Management Influencing Decision Making to buy Eco Car in Maha Sarakham Province”. Journal for Developing the Social and Community 7 (1). Bangkok, Thailand:71-86. https://so03.tci-thaijo.org/index.php/rdirmu/article/view/245079.