If the editor is being given primary credit for the work cited, then "ed." after the name indicates the person is receiving credit for editing, not authoring, the book.
An example:
Eliade, Mircea, and David Tracy, eds. What is Religion?: An Inquiry for Christian Theology. New York: Seabury Press, 1980.
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However, if the editor is not receiving primary credit, for example, an article in a subject encyclopedia, the editor is given credit after the name of the work the article appears in.
An example:
Sullivan, Lawrence E. "Tricksters: An Overview." The Encyclopedia of Religion. Ed. Mircea Eliade. 16 vols. New York: MacMillan, 1987.
Multiple editors of a subject encyclopedia would have this form.
Sullivan, Lawrence E. "Tricksters: An Overview." The Encyclopedia of Religion. Ed. Mircea Eliade and David Tracy. 16 vols. New York: MacMillan, 1987.
or
Sullivan, Lawrence E. "Tricksters: An Overview." The Encyclopedia of Religion. Ed. Mircea Eliade, David Tracy, and Marcia Peterson. 16 vols. New York: MacMillan, 1987.

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