McLeod, John, author
Sage Publications, 2002
Buku Teks
Shaw, Ian, author
Sage, 2001
Buku Teks
Norman K. Denzin, Yvonna S. Lincoln, editors
Sage Publications, 1994
Buku Referensi
Rice, Pranee Liamputtong, author
Oxford University Press, 1999
Buku Teks
Holloway, Immy, author
Blackwell, 1997
Buku Teks