Most general reference encyclopedias in religion have articles on Advent, and links to several are provided below. Pay special attention to bibliographies in the encyclopedia entries, which include references to the key works on a topic. Two kinds of online reference materials are included here. Listed to the left are CREDO and Oxford Reference topic or overview pages for Advent. Below are the more traditional reference works such as multi-volume encyclopedias, which are often the online edition of a work first produced in print.