Burns, James McGregor, author
Prentice-Hall, 1989
Buku Teks
Seckler-Hudson, Catheryn, author
United State Information Service, 1959
Buku Teks
Bingham, Richard D., author
McGraw-Hill, 1991
Buku Teks
Soehino, author
Liberty, 1991
Buku Teks
Soehino, author
Liberty, 1988
Buku Teks