Frances, Peter
Oxford University Press, 1969
Buku Teks
Mohammad Taufiq AR, author
Maarif Institute for Culture and Humanity, 2008
Buku Teks
Media Amora, author
2010
UI - Tesis (Open)
United Nations , [date of publication not identified]
Buku Teks
Rifyal Ka`bah, author
Universitas Indonesia, 2006
Buku Teks