Style and Citation Guides

Anthropology

Chicago Manual of Style

Art

Chicago or Turabian

Biology

CSE (Council of Science Editors)

Chemistry 

ACS (American Chemical Society)

Cinema Studies

MLA (Modern Language Association) or Chicago

Classics

Chicago or Turabian

Computer Science

IEEE Citation Reference and Editorial Style Manual

Earth and Oceanographic Science

GSA Bulletin - Style - from the Geological Society of America.

Economics

Chicago; author-date system is often used.  Sometimes APA

Education

APA (American Psycological Association)

English

MLA (Modern Language Association)

German

MLA (Modern Language Association)

Government and Legal Studies 

APSA (American Political Science Association). Based on Chicago style.

Government Documents

Examples based on Chicago, APA, MLA

History

Chicago; Note: students may prefer the endnote or footnote style -  rather than parenthetical style.

Turabian

Humanities

Chicago, Turabian or MLA (Modern Language Association)

Law

Usually but not always, Blue Book (Compiled by the Harvard Law Review Association, the Columbia Law Review, the University of Pennsylvania Law Review, and the Yale Law Journal.)

Mathematics

American Mathematical Society. AMS Author Handbook.

Music

Chicago or Turabian

Physics

AIP (American Institute of Physics)

Philosophy

Chicago, MLA (Modern Language Association), or, less common, APA (American Psycological Association)

Psychology

APA (American Psycological Association)

Religion

Chicago, MLA (Modern Language Association), or APA (American Psycological Association)

Sociology

ASA (American Sociological Association)

Theater & Dance

MLA (Modern Language Association)