Hollway, Wendy, author
Sage, 2003
Buku Teks
Norman K. Denzin, Yvonna S. Lincoln, editors
Sage Publications, 2000
Buku Referensi
Creswell, John W., author
SAGE Publications, 2018
Buku Teks
Rossman, Gretchen B., author
Sage, 2003
Buku Teks
Schratz, Michael, author
Routledge, 1995
Buku Teks