Sritalalai, A. and Na Thalang, C. 2020. The Significant Level of Marketing Mix Of Tourist Sites With Faith Naga Story In The Northeast Region (Udon Thani Province - Nong Khai Province - Bueng Kan Province - Nakhon Phanom Province) Thailand. Rajamangala University of Technology Tawan-ok Social Science Journal. 9, 1 (Jun. 2020), 143–157.