Postal codes in Switzerland and Liechtenstein (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Postal codes in Switzerland and Liechtenstein" in English language version.

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1swiss-philately.co.uk

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1gemeinde-simplon.ch

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ems.post

Italy – Inclusion of the Italian municipality of Campione d'Italia and the Italian waters of Lake Lugano in the customs territory of the European Union and in the territorial scope of Directive 2008/118/EC, Express Mail Service, January 6, 2020

gemeinde-simplon.ch

Gemeinde Simplon

swiss-philately.co.uk

Helvetia Philatelic Society of Great Britain New Letter, January 1988

tio.ch

Spedire una lettera a Campione? Attenzione al codice postale, Giorgio Doninelli, tio.ch, 31 December 2019