Salvatore, Dominick, author
McGraw-Hill, 1996
Buku Teks
Salvatore, Dominick, author
McGraw-Hill, 1993
Buku Teks
Keat, Paul G, author
Pearson Education International, 2003
Buku Teks
Curwen, Peter J.
Macmillan, 1974
Buku Teks
Samuelson, William F., author
Driden Press, 1999
Buku Teks