You can access to several digital reference works on world religions using the links below.  For more detailed information about any major religion use the links below.    

• Brill Dictionary of Religion. Brill. 2005
• Hutchinson Dictionary of World Religions. Helicon. 2005. 
• Concise Oxford Dictionary of World Religions. Oxford. 2000.
• Encyclopedia of Global Religion. Gale. 2012.