Friedman, David D., author
South-Western Publishing, 1986
Buku Teks
Pashigian, B. Peter, author
McGraw-Hill, 1998
Buku Teks
Friedman, Milton, 1912-2006, author
Aldine Publishing, 1962
Buku Teks
Miller, Roger LeRoy, author
McGraw-Hill International Book, 1985
Buku Teks
Quirk, James P
Sciece Research Associates, 1983
Buku Teks