provides attributes for pointing to the source of a bibliographic reference. provides a pointer to the bibliographical source from which a quotation or citation is drawn.

As Willard McCarty (2012, p.2) tells us, ‘Collaboration’ is a problematic and should be a contested term.

Grammatical theories are in flux, and the more we learn, the less we seem to know.

The Chicago Manual of Style, 15th edition. Chicago: University of Chicago Press (2003), p.147.