I. Indiyanti, D. . Asmarani, and S. Sutopo, “Development of hots-based math textbooks to improve critical thinking skills”, J. Math Educ. Nusant. Wahana Publ. Karya Tulis Ilm. di Bid. Pendidik. Mat., vol. 9, no. 2, pp. 156–170, Nov. 2023.