1. NCTM, Principles and Standars for School Mathematics (Reston, Virginia, 2000).
2. R. Rosnawati, in TIMSS 2011, Prosiding Seminar Nasional Penelitian (Universitas Negeri Yogyakarta, 2013).
3. Ministry of National Education, High School Mathematics Competency Standards Curriculum and Madrasah Aliyah (Ministry of National Education, Jakarta, 2006).
4. IMSTEP-JICA, Monitoring Report on Current Practice on Mathematics and Science Teaching and Learning, (IMSTEP-JICA, Bandung, 1999).
5. S.U. Sajiman, Statistics Application in Research, (PT Ufuk Press, Jakarta, 2012).