Buku Teks
Trulove, James Grayson
Rockport Publisher, 2000
Buku Referensi
edited by Alan Montefiore and David Vines
Routledge, 1999
Buku Teks SO
Cherlin, Andrew J.
McGraw-Hill, 2002
Buku Teks
Carpio, Rustica C.
Yayasan Obor Indonesia, 2005
Buku Teks SO