Kamm, Antony, author
Harper Collins Pub., 1993
Buku Referensi
edited by The Jaques Cattell Press
R.R. Bowker, 1970
Buku Referensi
edited by The Jaques Cattell Press
R.R. Bowker, 1965, 1966, 1967
Buku Referensi
United State Information Agency, 1994
Buku Teks
Hart, James, author
Oxford University Press, 1965
Buku Referensi