Scutchfield, F. D., & Keck, C. W. (2009). Principles of public health practice (3rd ed.). Delmar, Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Scutchfield, F. Douglas, agus C. William Keck. Principles of Public Health Practice. 3rd ed. Clifton Park, NY: Delmar, Cengage Learning, 2009.
Lua MLA (8ú heag.)Scutchfield, F. Douglas, agus C. William Keck. Principles of Public Health Practice. 3rd ed. Delmar, Cengage Learning, 2009.
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