Davis, Gary A.
Pearson, 2014
Buku Teks
Tomlinson, Carol Ann, editor
Crowin Press, 2004
Buku Teks
edited by Lani Florian
Sage Publications, 2014
Buku Referensi
edited by Norman K. Denzin, Yvonna S. Lincoln
Sage, 2011
Buku Referensi
SAGE publications, 2010
Buku Teks