References
- O'Connor , J. 1934 . Psychometrics, A Study of Psychological Measurements , Cambridge , Mass : Harvard Univ. Press. .
- Thorndike , E. L. 1931 . A Teacher's Word Book of the Twenty Thousand Words Found Most Frequently in General Reading for Children and Young People , New York : Teach. Coll., Columbia Univ. .
- Wells , F. L. 1927 . Mental Tests in Clinical Practice , New York : World Book. .