edited David Marsh and Gerry Stoker
Macmillan, 1995
Buku Teks
Baglione, Lisa A.
Thomson Wadsworth, 2007
Buku Teks
Kalvelage, Carl
Foresman, 1976
Buku Teks
Johnson, Janet Buttolph, 1950-
CQ Press, 2012
Buku Teks
Garson, G. David.
Holbrook Press, 1971
Buku Referensi