Ritthong , P., Rattanapan, K., Jitpukdee, S., & Muneenam, U. (2021). Development of Ability in Natural Resources and Environmental Protection Volunteers in Phatthalung Province. Journal of Vocational Education in Agriculture, 5(1), 49–60. retrieved from https://li01.tci-thaijo.org/index.php/JVIA/article/view/249328