Rittiboonchai, Witit, and Pichaya U- Thairatana. 2020. “The Second Order Confirmatory Factor Analysis in Deciding to Visit the Beaches, Phetchaburi Province: From the Concept of Marketing Mix”. Souphanouvong University Journal Multidisciplinary Research and Development 6 (1):9-15. http://www.su-journal.com/index.php/su/article/view/236.