Guidelines for Cornell Dissertations and Theses:
General guidance for thesis and dissertation styles are here: http://www.gradschool.cornell.edu/thesis-and-dissertation.
Note that "The Graduate School sets the minimum format theses and dissertations, while the content and length is decided by students with guidance from their special committee, and advisor/chair. Generally, the thesis and dissertation should conform to the standards of leading academic journals in the relevant field. The Graduate School does not monitor the thesis or dissertation for mechanics, content, or style."