Sonthirak, T., R. Lakhamja, W. Rawengwan, S. Lertpatiwong, and P. Boonjanda. “The Development of English Skills for Homestay Tourism through Community Participation for Huai Kha Khaeng Wildlife Sanctuary Tourism Promotion: A Case Study of the Ra Bum Community, Lan Sak District, Uthai Thani Province”. Humanities and Social Sciences Nakhonsawan Rajabhat University Academic Journal, vol. 10, no. 1, June 2023, pp. 56-70, https://so05.tci-thaijo.org/index.php/hssnsru/article/view/264457.