Hebel, J. R., & McCarter, R. J. (2006). A study guide to epidemiology and biostatistics (6th ed.). Jones and Bartlett Publishers.
Lua i Stíl Chicago (17ú heag.)Hebel, J. Richard, agus Robert J. McCarter. A Study Guide to Epidemiology and Biostatistics. 6th ed. Sudbury, Mass.: Jones and Bartlett Publishers, 2006.
Lua MLA (8ú heag.)Hebel, J. Richard, agus Robert J. McCarter. A Study Guide to Epidemiology and Biostatistics. 6th ed. Jones and Bartlett Publishers, 2006.
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