Sundayana, Rostina, and Cindy Elsa Parani. “Analyzing Students’ Errors in Solving Trigonometric Problems Using Newman’s Procedure Based on Students’ Cognitive Style”. Mosharafa: Jurnal Pendidikan Matematika, vol. 12, no. 1, Jan. 2023, pp. 135-44, doi:10.31980/mosharafa.v12i1.762.