Chicago Style comes from the Chicago Manual of Style, published by the University of Chicago Press. The style guide covers specifics of language throughout a document, as well as a style for citation.
Chicago Style can refer to two different ways of citing sources:
Each of the two styles has their own format for the list of cited sources at the end of a paper. In both cases, however, the sources appear in alphabetical order. See the linked chapters above or the list of recommended resources below.