Portney, L. G., & Watkins, M. P. (1993). Foundations of clinical research: Applications to practice. Appleton & Lange.
Lua i Stíl Chicago (17ú heag.)Portney, Leslie Gross, agus Mary P. Watkins. Foundations of Clinical Research: Applications to Practice. Norwalk, Conn: Appleton & Lange, 1993.
Lua MLA (9ú heag.)Portney, Leslie Gross, agus Mary P. Watkins. Foundations of Clinical Research: Applications to Practice. Appleton & Lange, 1993.
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