Schwandt, Thomas A.
Dictionary of qualitative inquiry
Sage, 2001
 Buku Referensi
Creswell, John W.
Qualitative inquiry and research design : choosing among five traditions
Sage, 1998
 Buku Teks SO
Creswell, John W.
Qualitative inquiry and research design : choosing among five approaches
SAGE Publications, 2018
 Buku Teks SO
Glaser, Barney G.
The Discovery of grounded theory: strategies for qualitative research
Aldine, 1967
 Buku Teks SO
Ragin, Charles C.
The Comparative method : moving beyond qualitative and quantitative strategies
University of California Press, 1987
 Buku Teks SO