The Internet History Sourcebooks Project is a collection of public domain and copy-permitted historical texts presented cleanly (without advertising or excessive layout) for educational use. It includes many texts relating to the development of Christianity in the early, medieval, and modern periods.

Helpful bibliographies of major works in different eras of and major topics in church history.

Provides a comprehensive listing of online resources for the study of the early church and offers a wide selection of annotated web resources with links (see web page under Resources, Early Christian Texts, Early Christian Authors, among others).

An older website that has not been updated since 2004. However, it remains valuable for finding resources on church history and theology in the Medieval period.

The Meeter Center houses one of the world’s largest collections of materials on John Calvin, Calvinism, the Reformation and early modern studies. Their website provides many resources, including digital versions of John Calvin's major works.

The mission of the PCA Historical Center is to preserve the records of the Presbyterian Church in America along with four of her predecessor denominations. The Center also houses the manuscript collections of over 150 people connected with those denominations, plus history materials for some 700 congregations. A modest research library covering all aspects of American Presbyterianism, augments the Center’s archival collections.