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Dyfyniad Arddull ChicagoPortney, Leslie Gross, and Mary P. Watkins. Foundations of Clinical Research: Applications to Practice. Norwalk, Conn: Appleton & Lange, 1993.
Dyfyniad MLAPortney, Leslie Gross, and Mary P. Watkins. Foundations of Clinical Research: Applications to Practice. Appleton & Lange, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.