American Anthropological Association (AAA) Style now adheres fully to the current edition of the Chicago Manual of Style (Author-Date).
Chemistry disciplines use the ACS Guide to Scholarly Communication, a style guide maintained by American Chemical Society.
AP Style is used by journalists; it is the style you'll encounter most often in the popular press.
The Annals of the Association of American Geographers follows the citation rules outlined in the Chicago Manual of Style (CMS). The following style sheets, may be used as supplements to the CMS to provide guidance when formatting citations according to AAG rules.