Fritzsche, David J.
McGraw-Hill, 2005
Buku Teks
Carman, Robert A.
John Wiley & Sons, 1982
Buku Teks
Hamburg, Morris
Harcourt Brace Jovanovick, 1985
Buku Teks
Bormann, Ernest G.
Harper & Row, 1965
Buku Teks
Lieberman, Michael
Wolters Kluwer, 2009
Buku Teks