Reference: General Reference

Abbreviations.com is the world's largest and most comprehensive directory and search engine for acronyms, abbreviations and initialisms on the Internet.

About.com is an online source for original information and advice. It is divided into topic sites, which are grouped into channels and covers diverse subject It is owned by The New York Times Company.

Constitute offers access to the world’s constitutions that users can systematically compare them across a broad set of topics — using a modern, clean interface.

Global data that is country-, region- and industry-specific and world-wide information on associations, jobs, news and other items related to international business

OECD iLibrary contains all the publications and datasets released by OECD (Organisation for Economic Cooperation and Development), International Energy Agency (IEA), Nuclear Energy Agency (NEA), OECD Development Centre, PISA (Programme for International Student Assessment), and International Transport Forum (ITF) since 1998.

Refdesk is a free and family-friendly web site that indexes and reviews quality, credible, and current web-based resources.