References
- Thurstone , L. and Chave , E. J. 1929 . The Measurement of Attitude , 1 – 96 . Chicago : University of Chicago Press .
- Neilson , N. P. and Cozens , Fred W. 1934 . Achievement Scales in Physical Education Activities for Boys and Girls in Elementary and Junior High Schools , 16 – 37 . New York : A. S. Barnes & Co. . 18