Bruce, Martha
Bloomsbury Proffesional, 2012
Buku Teks
Nicolson, Miklos S.
Prentice-Hall, 1972
Buku Teks
edited by Susan E. Israel, Gerald G. Duffy
Routledge, 2009
Buku Referensi
Lawrence Erlbaum Associates, 2004
Buku Teks
edited by Norman K. Denzin, Yvonna S. Lincoln
Sage, 2011
Buku Referensi