H. Fatimah, I. W. . Sumberartha, and A. M. . Setiawan, “The Validity and Readability Test for the Development of PBL-Based UKBM Teaching Materials on the Physics of the Human Circulatory System is Oriented Towards Students’ Critical Thinking ”, jppipa, pendidikan ipa, fisika, biologi, kimia, vol. 9, no. 1, pp. 9–12, Jan. 2023.