Hocleitner, Ricardo Diez
UNESCO, 1978
Buku Teks
Anderson, Gary J.
Unesco, 1978
Buku Teks
Delphin, Patricia
Virgnia Reston publishing 1983 , 1983
Buku Teks
Marquez, Gabriel Garcia, author
David Campbell Publishers, 1998
Buku Teks
Marland, Sidney P., author
McGraw-Hill, 1974
Buku Teks