R. . Sankammeun, R. . Phuphaibul, and A. . Patoomwan, “The Effects of a Booster Program for Sexual Risk Behavior Prevention on Attitude, Subjective Norm, Perceived Behavior Control and Sexual Abstinence Intention of the 9th Graders”, NJPH (วารสาร พ.ส.), vol. 31, no. 2, pp. 195–208, Aug. 2021.