The International Biographical Dictionary of Religion is an important reference for any individual or institution interested in the key leaders of the major religions of the world.

Leaders from Christianity, Islam, Buddhism, Hinduism, Sikhism, Baha'i, Confusianism, Jainism, Shintoism and Judaism are included.

The first volume of this series includes the official texts of 393 statutes of international nongovernmental organizations of Types A, B and C of the Yearbook of International Organizations, namely bodies with membership in countries in at least two continents. The series covers statutes in a variety of forms. It does not however include internal regulations such as "by-laws", unless there is no other constitutional document. Priority is given to the English language version of statutes.

The World Guide to Religious and Spiritual Organizations 1st edition lists 3,495 associations, orders, fraternities, institutes, networks, programmes, and other bodies:

• whose purpose is to further religious and spiritual aims,
• whose orientation is directed to religious and spiritual concerns,
• whose activities centre on religious and spiritual concerns,

representing all major world faiths and spiritual movements.