Creswell, John W. Qualitative inquiry and research design : choosing among five approaches / John W. Creswell - 3rd ed. - Los Angeles, CA : Sage Pub., c2013 - xxi, 448 p. : ill. (some dol.) ; 23 cm. Includes bibliographical references and index ISBN: 9781412995313 1412995310 Subjects--Topical Terms: Social sciences--Methodology