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Interviewing as qualitative research : a guide for researchers in education and the social sciences
Seidman, I. E., (1991)
Praxisbuch empirische Sozialforschung in den Erziehungs- und Bildungswissenschaften
Stigler, Hubert, (2005)
Methodological choice and design : scholarship, policy and practice in social and educational research
Markauskaite, Lina, (2010)
Evaluability assessment: Reflections on the process
Smith, M. F., (1990)