Sri Rahayu Putri. AN ANALYSIS OF VALIDITY IN SUPERMIND TEXTBOOK 1. Int Conf CEC [Internet]. 2022 Feb. 1 [cited 2026 Apr. 9];1(1):118-22. Available from: https://mail.yayasancec.or.id/cfc2.yayasancec.or.id/index.php/intc/article/view/33