Bernstein, Richard J., author
Polity, 2013
Buku Teks
Berlitz, Charles, author
Granada Publishing, 1977
Buku Teks
Timerman, Jacobo, author
Vintage Books , 1982
Buku Teks
Johnson, Allan G., author
McGraw-Hil, 1997
Buku Teks
Auerbach, Jerold S., author
Oxford University Press, 1983
Buku Teks