1. NCTM, Principles and Standards for School Mathematics (NCTM, Reston, VA, 2000).
2. Ministry of Education Indonesia, www.bsnpindonesia.org (2018).
3. Y. S. Kusumah, D. Kustiawati, and T. Herman, Int. J. Instr. 13 (2020).
4. S. Jelatu, Sariyasa, and I. M. Ardana, Int. J. Instr. 11 (2018).
5. G. Dwirahayu, D. Suryadi, and B. G. Kartasasmita, Wudpecker J. Educ. Res. (2013).