Grant, Jim
Routledge, 2008
Buku Teks SO
Spanogle, John A.
St. Paul Minn, 2000
Buku Teks
Folsom, Ralph Haughwout
West Group, 1999
Buku Teks
Grant, Jim
Routledge, 2002
Buku Teks SO
Alex Tilbury, Theresa Clementson, Leslie Hendra, David Rea, Maggie Baigent, Chris Cavey, Nick Robinson ; consultant editor Adrian Doff
Cambridge University Press , 2012
Buku Teks SO