Prapaporn Sompakdee และ Uthaivan Danvivath. (2020) Developing English for Tour Guides Material: Khmer Sanctuary Guides. <i>Humanities, Arts and Social Sciences Studies</i>, <i>20</i>(1), 42-64.Prapaporn Sompakdee และ Uthaivan Danvivath. "Developing English for Tour Guides Material: Khmer Sanctuary Guides". Humanities, Arts and Social Sciences Studies 20 (2020):42-64.Prapaporn Sompakdee และ Uthaivan Danvivath. Developing English for Tour Guides Material: Khmer Sanctuary Guides. Silpakorn University Research and Development Institute:ม.ป.ท. 2020.