Credo Reference This link opens in a new windowCredo Reference has 3.2 million entries from more than 450 encyclopedias, dictionaries, handbooks, guides, and atlases in all fields. Sources are selected from major publishers, such as Bloomsbury, Cambridge University Press, Elsevier, Greenwood, Penguin, Routledge, Sage, Thames and Hudson, Wiley, and more. Bangor Public Library provides access via its in-house workstations.