References
- American National Red Cross . 1961 . Water safety instructor's manual , 180 Washington , D.C. : American National Red Cross .
- Silvia , Charles E. 1957 . Manual for swimming, water stunts, diving, life saving, and water safety , 110 New York : Cardinal Press .
- Whiting , H. T. and Stembridge , D. E. 1965 . Personality and the persistent non-swimmer . Research Quarterly , 30 : 348 – 56 .