Encyclopedia of Hinduism: Fully searchable, Brill's online encyclopedia presents the latest research on all the main aspects of the Hindu traditions.
Encyclopaedia Islamica Abridged and edited translation of one of the most comprehensive sources on Islam and the Muslim world.
Encyclopaedia of Islam, 3rd ed. Revised and expanded edition of Brill's encyclopedia, aiming to cover all areas of the world with a Muslim presence.
The Oxford Encyclopedia of the Islamic World, REF DS35.53 O96 2009. This 6 volume set "describes all aspects of Islamic society in the nineteenth and twentieth centuries - from beliefs, institutions, and movements to practices and people". Includes bibliographies.
A Popular Dictionary of Islam 1997; Rev. ed. Defines basic concepts in Islam. Both Arabic and English terms are defined.