Compiled by Richard R. Wright, Jr. Reference work published in 1916.

An encyclopedia of the African Methodist Episcopal Church, published in 1882.

Human edited. With a focus on the Theravada school of Buddhism.

Explanation of various terms and concepts that occur in spiritual literature.

Information on Anabaptist-related (Amish, Mennonite, Hutterite, Brethren in Christ) topics, source documents, and history.

Contains the complete contents of the 1906 Jewish Encyclopedia. Over 15,000 articles and pictures about the Torah, history, literature, biography, geography, genealogy, and theology. Accessible for free and full-text searchable.

Statistical information on world religions, Christian denominations, and people groups. Based on the 2600-page World Christian Encyclopedia and World Christian Trends. A full-time staff at The Center for the Study of Global Christianity updates and maintains the database. Limited access is free; paid access gets full set of features.

Links to the contents of the Catholic Encyclopedia, Easton's Bible Dictionary, Torrey's Topical Textbook, Elwell's Dictionary of Christian Theology, and other sources.