Anton Tabah, author
Klaten Sahabat 2000,
Buku Teks
Williams, E.N., author
Penguin Books, 1970
Buku Teks
State University of New York Press, 2001
Buku Teks
Emerson, Rupert, author
Cambridge: Harvard University Press, 1960
Buku Teks
New Jersey Prentice-Hall 1965
Buku Teks