American Helvetia Philatelic Society:
web: www.swiss-stamps.org

Union of Swiss Philatelic Societies:
web: www.vsphv.ch

Swiss Association of Postmark Collectors:
web: www.svps-ascep.ch

Swiss Postal Stationery Collectors Club:
web: www.ganzsachen.ch

Swiss Thematic Association:
web: www.thema-briefmarken.ch

Museum of Communication, Bern:
web: http:www.mfk.ch/en/collection

British Library: Philatelic Collections
web: www.bl.uk/collections/philatelic

The Royal Philatelic Society, London:
web: www.rpsl.org.uk

UK Philately:
web: www.ukphilately.org.uk

The National Philatelic Society:
web: www.ukphilately.org.uk/nps

The Universal Postal Union:
web: www.upu.int/en.html

Philatelie Liechtenstein:
web: www.philatelie.li

United Nations Postal Adminstration:
web: unstamps.un.org