TY - BOOK AU - Creswell, W. John TI - Research Design: Qualitative, Quantitive, and Mixed Methods Approaches SN - 9781412965569 AV - H62.C86 KP-0000411 PY - 2009/// CY - Los Angeles PB - Sage Publications KW - Social-sciences -- Research--Methodology KW - Social sciences--Statistical mehods N1 - Includes bibliographical references and index ER -