Internet Encyclopedia of Philosophy (IEP), an open source, peer-reviewed academic resource
Stanford Encyclopedia of Philosophy (SEP), an open source, grant funded, academic resource
Christian Classics Ethereal Library (CCEL), Early Church Fathers and Christian Classic texts
Internet Medieval Sourcebook, historical texts presented on the internet, edited by Paul Halsall, Fordham University
Internet Medieval Sourcebook Full Text Sources, edited by Paul Halsall
Internet Ancient History Sourcebook, (a companion to the Internet Medieval History Sourcebook and the Internet Modern History Sourcebook), Fordham University, edited by Paul Halsall.
POxy: Oxyrhynchus Online, Sackler Library, University of Oxford, United Kingdom (Papyri database)
PhilPapers, Comprehensive index, bibliography of philosophy and open access archive, edited by David Bourget (University of Western Ontario) and David Chalmers (Australia National University and New York University)
Purdue OWL Online Writing Lab, Purdue University, West Lafayette, Indiana
APU Honors College Citation Manual (see Faculty for hardcopy)