M. Amien Rais, author
Mizan, 1998
Buku Teks
Gardner, John
Weidenfeld and Nicolson, 1974
Buku Teks
Grasso, John T.
Carnegie Foundation, 1979
Buku Teks
Cleveland, Harlan, author
McGraw-Hill, 1960
Buku Teks
Morales, Armando, author
Allyn and Bacon, 1977
Buku Teks