Creswell, John W., author
Sage, 1994
Buku Teks
Mertens, Donna M., author
SAGE, 2014
Buku Teks
Leavy, Patricia, 1975-, author
The Guilford Press, 2017
Buku Teks
Green, Judith, 1961-, author
Sage, 2018
Buku Teks
Patton, Michael Quinn, author
SAGE, 2015
Buku Teks