Hongthong, Thannapaporn. 2018. “Motivation and Work of Volunteerism in The Royal Cremation Ceremony of His Majesty King Bhumibol Adulyadej, Rama IX”. วารสารสันติศึกษาปริทรรศน์ มจร 6 (sp1):490-501. https://so03.tci-thaijo.org/index.php/journal-peace/article/view/123855.