Polgar, Stephen. Introduction to research in the health sciences / Stephen Polgar, Shane A. Thomas. - 5th ed. - London : Churchill Livingstone, 2008. - x, 393 p. : ill. ; 25 cm. Includes Index. Includes bibliographical references. ISBN: 9780443074295 (pbk.) Subjects--Topical Terms: Medicine--Research--Methodology.Research--methods.