Buku Teks
Hecht, Eugene, author
McGraw Hil , 2012
Buku Teks
Wilson, Jerry D., author
Prentice-Hall, , 2003
Buku Teks
ARCO The 1st Name in College Guides
Macmillan General Reference, 1994
Buku Referensi
Gustafon, R. David, author
Thomson Brooks/Cole, 2007
Buku Teks