NAVARUTTANAPORN, S. A Study on the Effects of Self-Learning Media Packages on the Retention of English-Speaking Skills: A Case Study of Front Desk Staff at Loei Palace Hotel, Loei Province. Research and Development Journal, Loei Rajabhat University, [S. l.], v. 21, n. 77, p. 105–119, 2026. DOI: 10.14456/lruj.2026.28. Disponível em: https://so05.tci-thaijo.org/index.php/researchjournal-lru/article/view/281967. Acesso em: 17 sep. 2026.