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Methodenhandbuch
Kopp, Ralf, (1999)
Qualitative research & evaluation methods
Patton, Michael Quinn, (2002)
Qualitative and mixed methods in public health
Padgett, Deborah K., (2012)
Making methods choices
Patton, Michael Quinn, (1980)
Qualitative evaluation methods
Patton, Michael Quinn, (1984)
Utilization-focused evaluation
Patton, Michael Quinn, (1978)