Squid Documentation

• O'Reilly's Book on Squid: The Definitive Guide (Jan 2004)
• Oksar's Squid Users Guide
• Frequently Asked Questions
• Configuration Guide
• Tutorial on Configuring Hierarchical Squid Caches
• RFC 1016
• Programmers Guide (incomplete!!)
• Squid Sizing for Intel Platforms by National Janet Web Cache Service staff.

• German: Squid Proxyserver Administrationshandbuch
• German: Squid Proxyserver Administrationshandbuch in print
• Turkish: SQUID ELKITABI
• Italian: Squid-Book: oltre le FAQ
  
• Brazilian Portuguese: Configurando um Squid "Ninja"
• Brazilian Portuguese: O SQUIDNOMICON
• Brazilian Portuguese: Guia sobre Squid/Proxy Transparente
• Russian: Collection of Russian Squid Documentation

Internet Cache Protocol

• RFC 2186: Internet Cache Protocol (ICP), version 2
• RFC 2187: Application of Internet Cache Protocol (ICP), version 2

Cache Digests

• Frequently Asked Questions
• Internet-draft-like document describing Squid-2.1.PATCH2 implementation.