หลั่งประยูร ภ. “The Development of English Writing Skill Exercises for the Students in Teaching English Program in Faculty of Education Phranakhon Si Ayutthaya Rajabhat University”. Journal of Educational Review Faculty of Education in MCU, vol. 6, no. 1, May 2019, pp. 231-4, https://so02.tci-thaijo.org/index.php/EDMCU/article/view/181962.