Patton, Michael Quinn, author
Qualitative evaluation and research methods
SAGE Publ., 1990
 Buku Teks
Patton, Michael Quinn, author
Qualitative research and evaluation methods
SAGE, 2015
 Buku Teks
Mertens, Donna M., author
Research and evaluation in education and psychology : integrating diversity with quantitative, qualitative, and mixed methods
SAGE, 2014
 Buku Teks
Green, Judith, 1961-, author
Qualitative methods for health research
Sage, 2018
 Buku Teks
Rice, Pranee Liamputtong, author
Qualitative Research Methods
Oxford University Press, 1999
 Buku Teks