MacroReference contains references to large areas of knowledge, FAQs where available, and pointers to relevant areas of the MicroReference. MicroReference contains short bits of information and references to specific subjects. Grup Enciclopedia Catalana - Founded in Barcelona in 1965, for the purpose of publishing great reference works. Consists of 15 volumes with the collaboration of more than 2,000 specialists. The Probert Encyclopaedia - Serious reference source with over 60,000 fully hypertext linked entries covering the entire spectrum of human knowledge.
Content is aimed at journalists and researchers.
Quisdom - The encyclopedia of trivia. Includes such things as the definitions of acronyms and abbreviations, flags of the world, entertainment milestones, concise information about sports and religion, and so forth. Includes resources for parents and teachers, features on current events, educational activities for children, and World Book product information. Help build the largest human-edited directory on the web.