The Education authorities directory and annual 1989
School Government Publishing Co., [date of publication not identified]
 Buku Referensi
The British trade union directory
edited and compiled by Wolodymyr Maksymiw
Longman, 1990
 Buku Referensi
Whitaker : publishers in the United Kingdom and their addresses, 1995
J. Whitaker & Sons, 1995
 Buku Referensi
Shorter Aslib directory of information sources in the United Kingdom
edited by Ellen M. Codlin
Aslib, 1986
 Buku Referensi
Aslib directory of information sources in the United Kingdom : volume 1 social sciences, medicine and the humanities
edited by Ellen M. Codlin
Aslib, 1982
 Buku Referensi