P. . Phiphithkul, R. . Samawathdana, and A.- utcha . Wattanaburanon, “PROPOSED GUIDELINES OF DEVELOPING THE HEALTH EDUCATION PROGRAM BASED ON CONSTRUCTIONISM CONCEPT AND HEALTH BELIEF MODEL FOR ENHANCING HEALTH LITERACY ON HEALTH PRODUCTS OF VOCATIONAL EDUCATION STUDENTS”, J.TNSU, vol. 13, no. 3, pp. 235–248, Aug. 2021.