1. Wiggins G, McTighe J (1998) Understanding by design. Alexandria, VA: Association for Supervision and Curriculum Development.
2. Thorndike RM (2005) Measurement and evaluation in psychology and education, 7th ed. Upper Saddle River, New Jersey: Pearson Education, Inc.
3. Test length and cognitive fatigue: An empirical examination of effects on performance and test-taker reactions;PL Ackerman;J Exp Psychol: Appl,2009
4. Ackerman PL, Kanfer R (2006) Test length and cognitive fatigue. Final report to the College Board. Atlanta, GA: Author.
5. Mental fatigue;T Arai;Contributions to Education,1912