References
- Community Occupational Surveys. U. S. Office of Education . 1942 . 135 – 139 . Bulletin No. 223, 3-67
- Shartle , C. L. 1946 . Occupational Information , 33 – 43 . New York : Prentice-Hall .
- Strang , R. 1937 . Counseling Technics in College and Secondary School , 32 – 82 . New York : Harper .