American men of science : a biographical directory
edited by The Jaques Cattell Press
R.R. Bowker, 1970
 Buku Referensi
Directory of further education 1987/8
Hobsons Pub.,, 1987
 Buku Referensi
The Education authorities directory and annual 1987
School Government Publishing Co., 1987
 Buku Referensi
Kompassindo
Standard trade & industri directory of Indonesia
Jakarta : Kompassindo, 1994,
 Buku Referensi
Directory of Acronyms (Index of Conference Proceedings)
The British Library Board
The British Library Board, 1993
 Buku Referensi