Eccleston, Charles H.
CRC Press, Taylor & Francis Group, 2011
Buku Teks
Bolton, Arthur, 1921-
McGraw-Hill, 1994
Buku Referensi
Stead, Alan
Facet Publishing, 2008
Buku Referensi
Giddens, Jean Foret
Elsevier, 2005
Buku Teks
Thomlison, Barbara
Brooks/Cole Thomson Learning, 2002
Buku Teks