CronbachI. J. (1951). Coefficient alpha and the internal structure of tests. Psychometrics, 16, 297-334.
2.
GottfredsonL. S. (1997). Mainstream science on intelligence: An editorial with 52 signatories, history, and bibliography. Intelligence, 24, 13-23. doi:10.1016/S0160-2896(97)90011-8
3.
SnydermanM.RothmanS. (1987). Survey of expert opinion on intelligence and aptitude testing. American Psychologist, 42, 137-144. doi:10.1037/0003-066X.42.2.137