edited by Quentin H. Stanford
Oxford University Press, 1972
Buku Teks
Voice of America, U.S. Information Agency, 1969
Buku Teks
edited by Philip M. Hauser
Prentice-Hall, 1969
Buku Teks
United Nations
United Nations, 1987
Buku Teks
Habakkuk, H.J.
Leicester University Press, 1972
Buku Teks