Crosby, R. A., DiClemente, R. J., & Salazar, L. F. (2006). Research methods in health promotion. Jossey-Bass.
Lua i Stíl Chicago (17ú heag.)Crosby, Richard A., Ralph J. DiClemente, agus Laura Francisca Salazar. Research Methods in Health Promotion. San Francisco, CA: Jossey-Bass, 2006.
Lua MLA (8ú heag.)Crosby, Richard A., et al. Research Methods in Health Promotion. Jossey-Bass, 2006.
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