1. C. Keitel. Social justice and mathematic education gender, class, ethnicity and the politics of schooling. (Freire Universitas Berlin, Berlin, 2001).
2. K. E. Lestari, dan Yudhanegara, M. R. Penelitian pendidikan matemtika. (Refika Aditama, Bandung, 2015), pp 66–67
3. National Council of Teacher of Mathematics (NCTM). Principles and Standards for School Mathematics. (National Academy Press, Washington D.C, 2000).
4. E. E. Maccoby, & C. N. Jacklin. The psychology of sex differences (Vol. 2). Stanford University Press. (1978).
5. Pre-Service Teachers’ Opinions on Teaching Thinking Skills