CRESWELL, JOHN W. RESEARCH DESIGN: QUALITATIVE, QUANTITATIVE, AND MIXED METHODS APPROACHES - 2ND ED. - Estados Unidos SAGE 2003 THOUSAND OAKS - 246 ISBN: 0761924426 LCCN: 62762 Subjects--Topical Terms: DISEŅOINVESTIGACIONMETODOS CUALITATIVOSMETODOS CUANTITATIVOS Dewey Class. No.: 001.434