BarakatM. K.“A Factorial Study of Mathematical Abilities”. Brit. J. Psychol. Stat. Section, 4, 1951, 137–156.
2.
BloomB. S. (Ed.). Taxonomy of Educational Objectives: The Classification of Educational Goals. Handbook I. Cognitive Domain. New York: Longmans, Green and Co., 1956.
3.
BurtC. L.“The Genetic Determination of Differences in Intelligence”. Brit. J. Psychol., 57, 1966, 137–153.
4.
EvansG. T.The Growth of Mathematical Ability. Unpublished Ph.D. thesis, University of Queensland, 1965.
5.
FrenchJ. W.“The Description of Aptitude and Achievement Tests in Terms of Rotated Factors”. Psychometric Monograph, 5. Chicago: University of Chicago Press, 1951.
6.
GarrettH. E.“A Developmental Theory of Intelligence”. American Psychologist, 1, 1946, 372–378.
7.
HamleyH. R. “Relational and Functional Thinking in Mathematics”. The Ninth Yearbook. The National Council of Teachers of Mathematics. New York: Bureau of Publications, Teachers College, Columbia University, 1934.
8.
KlineW. E.A Synthesis of Two Factor Analyses of Intermediate Algebra. Princeton University and Educational Testing Service, 1956. Project on Mathematical Techniques in Psychology, Principal Investigator, Harold Gulliksen.
9.
LeeD. M.“A Study of Specific Ability and Attainment in Mathematics”. Brit. J. Educ. Psychol., 25, 1955, 178–189.
10.
SpearmanC.The Nature of “Intelligence” and the Principles of Cognition. London: Macmillan, 1923.
11.
VernonP. E.The Structure of Human Abilities. (2nd ed.) London: Methuen, 1960.
12.
WerdelinI.The Mathematical Ability. Studia Psychologica et Paedagogica, Series altera, Investigationes IX, Copinhagen, Lund, 1958.
13.
WrigleyJ.“The Factorial Nature of Ability in Elementary Mathematics”. Brit. J. Educ. Psychol., 28, 1958, 61–78.