Credo Reference is a full-text reference service. The Phillips religion collection includes The Brill Dictionary of Religion, The Routledge Companion to the Christian Church, Encyclopedia of Protestantism, and The Blackwell Companion to Jesus.
Phillips University Yearbooks from 1914-1997, except for 1918, 1956, and 1957. The yearbooks were digitized by the Phillips University Legacy Foundation. 
Loebolus contains the works in the Loeb Classical Library of Greek and Roman writings which have entered the public domain. Works may be downloaded as PDFs. 
The Latin America Collection at Princeton Theological Seminary, enhanced by the donated library of President Emeritus John A. Mackay in 1983, comprises over 28,000 books in Spanish and Portuguese and 1,300 periodicals supporting instruction and research in Latin American religious culture. The Library’s collecting concentration on religion and theology in Mexico, Central America, the Caribbean and South America is closely interwoven with Latin American collecting at Princeton University.
Open Library is an initiative of the Internet Archive, and contains contains information about books. Internet Archive hosts a collection of digitized books. Open Library’s universal catalog provides links to discover, borrow, and read from the Internet Archive’s collections. 
Search the Atla and EBSCO databases for articles on your research topic. 
ACLS Humanities E-Book (HEB) is an online collection of over 5,400 books of high quality in the humanities and related social sciences. 