Pashigian, B. Peter
McGraw-Hill, 1998
Buku Teks
Friedman, Milton, 1912-2006
Aldine Publishing, 1962
Buku Teks
Miller, Roger LeRoy
McGraw-Hill International Book, 1985
Buku Teks
Quirk, James P
Sciece Research Associates, 1983
Buku Teks
Freeman, A. Myrick, 1936-
Harper & Row , 1983
Buku Teks