1. Problem formulation: Insight from student generated questions;Gonzales;School science and mathematics,1996
2. A revision of Bloom's taxonomy: An overview;Krathwohl;Theory into practice,2002
3. Polya, G. (1962, 1965). Mathematical discovery on understanding, learning, and teaching problem solving, Volume I, Volume II. N.Y., London, Sydney: John Wiley & Sons, 1962 (Volume I), 1965 (Volume II).
4. On mathematical problem posing;Silver;For the learning of mathematics,1994
5. Empowering students’ problem solving via problem posing: The art of framing “good” question;Stoyanova;Australian Mathematics Teachers,2000