1. Ministry of Education. Act of Republic Indonesia No. 20 of 2003 about National Education System, (2003).
2. F.M. Connely, The Sage Hand book of Curriculum and Instruction (Sage Publications Inc, California, 2008), pp. 66.
3. D.R. Shaffer, and K. Kipp, Developmental Psychology Childhood & Adolescene 9th edition, (Cengage Learning, Georgia, 2010), pp. 205.
4. Anderson and Krathwohl, A Taxonomy for Learning, Teaching, and Assessing A Revision of Bloom’s Taxonomy of Educational Objectives, (Addison Wesley Longman Inc, New York, 2001), pp. 67 –70.
5. Ministry of National Education. The Decree of the National Education Minister No. 21 of 2016 about Standard Content in Primary and Secondary Education (2016).