The World almanac and book of facts 1988
Newspaper Enterprise Association, 1987
 Buku Referensi
Civil engineer's reference book
edited by L.S. Blake
Butterworth, 1994
 Buku Referensi
Civil engineer's reference book
edited by L.S. Blake
Butterworth, 1986
 Buku Referensi
Civil service in wartime
edited by Leonard D. White
University of Chicago Press, 1945
 Buku Teks
Chapman, Richard A., author
The higher civil service in britain
Constable, 1970
 Buku Teks
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