References
- Steenbarger , BN and Manchester , RA . 1990 . Research in college health 1: An introduction to the research process . J Am Coll Health , 39 : 119 – 124 .
- Steenbarger , BN and Manchester , RA . 1993 . Research in college health 2: Designing the study . J Am Coll Health , 42 : 15 – 20 .
- Campbell , DT and Stanley , JC . 1966 . Experimental and Quasi-experimental Designs for Research , Chicago : Rand McNally .
- Burns , N and Grove , JK . 1987 . The Practice of Nursing Research , Philadelphia, PA. : WB Saunders .
- Ray , WJ and Ravizza , R . 1988 . Methods Toward a Science of Behavior and Experience. , 3rd ed. , Belmont, CA : Wadsworth .
- Gayle , HD , Keeling , RP Garcia-Tunon , M . Prevalence of the human immunodeficiency virus among university students . N Engl J Med. , 323 1538 – 1541 .