Basic Format
Last, First. Title of Book. Edition, Publisher, Publication date. Database, URL.
Last, First. "Title of Chapter." Title of Book, contribution by First Last, Edition, Publisher, Publication date, Pages. Database, URL.
Examples
Hart, James D., and Phillip W. Leininger. The Oxford Companion to American Literature. 6th ed., Oxford University Press, 2013. Oxford Digital Reference Shelf, http://www.oxfordreference.com/view/10.1093/acref/9780195065480.001.0001/acref-9780195065480.
Hall, Gary. "There Are No Digital Humanities." Debates in the Digital Humanities, edited by Matthew K. Gold, University of Minnesota Press, 2012, http://dhdebates.gc.cuny.edu/debates/text/21.