Gaya APA

Hebel., R, M, R, J. (1984). A study guide to epidemiology and biostatistics : including 100 multiple-choice questions (Second Edition). Baltmore: Aspen Pub. Inc..

Gaya MLA

Hebel., Richard, Morton,, Richard, J.. "A study guide to epidemiology and biostatistics : including 100 multiple-choice questions". Second Edition Baltmore: Aspen Pub. Inc., 1984. Text.