Mekwilai W, Rattanjan N, Sukyiran P, Udomsri S, Intharachat S. Effectiveness of a Positive Psychology-Based Happiness Activity Guidebook. JAR [internet]. 2024 Dec. 30 [cited 2026 Sep. 3];29(4):222-36. available from: https://so04.tci-thaijo.org/index.php/jar/article/view/275851