1] Annie Ward, Howard W. Stoker, Mildred Murray-Ward (1996), "Achievement and Ability Tests - Definition of the Domain", Educational Measurement, 2, University Press of America, pp. 2–5,
2] Arem, C.A., 2003. Conquering Math Anxiety. 2nd Edn., Brooks/Cole-Thomson Learning, Pacific Grove, ISBN-10: 0534386342, pp: 193.
3] Arem, C.A., 2009. Conquering Math Anxiety. 3rd Edn., Cengage Learning, Belmont, ISBN-10: 0495829404, pp: 215.