Encyclopaedia of Islam Brill's Encyclopaedia of Islam is a "completely new edition of the most important reference work in English on Islamic subjects".
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 the encyclopedia, aiming to cover all areas of the world with a Muslim presence.
Encyclopaedia of the World Muslims REF BP50.E53 2001, 4 volume set.
Oxford Dictionary of Islam 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 Islam1997; Rev. ed. Defines basic concepts in Islam. Both Arabic and English terms are defined.