Cohen, J., and P. Cohen (1983). Applied Multiple Regression/Correlation Analysis for the Behavioral Sciences, 2nd ed. Hillsdale, NJ: Lawrence Erlbaum Associates.
2.
Gregoire, T.G., and B.L. Driver (1987). "Type II Errors in Leisure Research." Journal of Leisure Research, 19 (4): 261-72.
3.
Howard, Dennis R , Samuel V. Lankford , and Mark E. Havitz (1991). "A Method for Authenticating Pleasure Travel Expenditures." Journal of Travel Research , 29 (Spring): 19-23.
4.
Roehl, Wesley S. (1992). "A Comment Concerning 'A Method for Authenticating Pleasure Travel Expenditures.'" Journal of Travel Research , 30 (Spring): 67-68.
