American Society for Health-System Pharmacists, 7272 Wisconsin Ave., Bethesda, MD 20814, USA.

American Society for Microbiology, 1325 Massachussets Ave, N.W. Washington DC 20005, USA.

Biomed: http://www.agreecollaboration.org

Essential Drugs Programme South Africa, National Department of Health, the Directorate: Pharmaceutical Programs and Planning, Private Bag X828, Pretoria 0001, South Africa; websites: http://www.doh.gov.za; http://pharmis.pwv.gov.za/publications1.htm

Kumarian Press Inc., 14 Oakwood Ave., West Hartford, CT 06119-227, USA; http://www.kpbooks.com

Management Sciences for Health, 165 Allandale Road, Boston, MA 02130-3400, USA. Tel. +1 617 524 7799; Fax: +16175242825; email: bookstore@msh.org; websites: http://www.msh.org/resources/publications/ index.html and http://erc.msh.org

Programme for Appropriate Technologies in Health (PATH), 4 Nickerson St., Seattle, WA 98109-1699, USA; website: http://www.path.org/resources/safe-inj-pdf.htm

Safe Injection Global Network, secretariat at WHO Geneva; website: http://www.injectionsafety.org

Scottish Intercollegiate Guidelines Network (SIGN), 9 Queen Street, Edinburgh EH2 1JQ, Scotland, UK; website: http://www.sign.ac.uk

Therapeutic Guidelines Ltd, Level 2, 55 Flemington Road, North Melbourne, Victoria 3051, Australia. Tel: +61 3 9329 1566; Fax: +61 3 9326 5632; email: sales@tg.com.au; website: http://www.tg.com.au

WHO Collaborating Centre for Drug Statistics Methodology, Postboks 100 Veitvet, Oslo, Norway, Tel. +47 22 16 98 11; Fax: +47 22 16 98 18; email: whocc@nmd.no; website: http://www.whocc.nmd.no

WHO Essential Drugs and Medicines Policy Department, CH 1211 Geneva 27; website: http://www.who.int/ medicines

WHO Drug Price Information Services; website: http://www.who.int/medicines/organization/par/ipc/ drugpriceinfo.shtml

WHO Publications, Geneva; email: bookorders@who.int; website: http://www.who.int/pub/en