McLeod, John, author
Sage Publications , 2003
Buku Teks
McLeod, John, author
Sage Publications, 2002
Buku Teks
Molly Andrews, Corinne Squire, Maria Tamboukou, editor
Sage, 2009
Buku Teks
Crouch, Christopher, author
Berg, 2012
Buku Teks
Silverman, David, author
Buku Teks