Creswell, John W. Designing and conducting mixed methods research / John W. Creswell, Vicki L. Plano Clark - 3rd ed. - Sage Publications 2018 27568 ISBN: 9781506386621 Source: Inv-2019-01-25 Subjects--Topical Terms: Social sciences - Research - MethodologyResearch - Evaluation LC Class. No.: H / 62