Pandikattu, Kuruvilla, author
The Council for Research in Values and Philosophy, 2001
Buku Teks
Vensus A.George
The council for reserch in values and philosophy, 2001
Buku Teks
Azumah, John Alembillah, author
Oneworld , 2001
Buku Teks
Bednarek, Monika, author
Cambridge University Press, 2018
eBooks
Kinown, Washington : U.S. Information Agency
Majalah, Jurnal, Buletin