Molly Andrews, Corinne Squire, Maria Tamboukou, editor
Sage, 2009
Buku Teks
Marshall, Catherine, author
Sage, 1999
Buku Teks
Viswanathan, Madhu, author
SAGE Publ., 2005
Buku Teks
Judd, Charles M., author
Methuen, 1991
Buku Teks
Sjoberg, Gideon
Harper & Row Publishers, 1968
Buku Teks