Tully, G.E. 1967. Test-Retest Reliability of the Raven Progressive Matrices Test (Form 1938) and the California Test of Mental Maturity, Level 4 (S-F 1963). Florida Journal of Educational Research. 9, 1 (Nov. 1967), 67–74. DOI:https://doi.org/10.62798/KBDM6243.