American Anthropological Association
Uses the Chicago Manual of Style (16th ed.) Z 253 U69 2010, available at Cloverdale, Langley, Richmond and Surrey, and Merriam-Webster's Collegiate Dictionary (11th ed.) PE 1628 W4 M4 2003, available at Langley, Richmond and Surrey. In Webster's, use the first spelling and American rather than British spellings.
September 9, 2015 - ... AAA has decided to cease production of the AAA Style Guide. AAA style now adheres fully to the current edition of the Chicago Manual of Style (Author-Date).
Society for American Archaeology
The authority for spelling is Merriam-Webster's Collegiate Dictionary. For any words not found in this dictionary, use Webster's Third New International Dictionary (unabridged). Use American English spellings. Choose the first spelling when multiple spellings are available.
From the Society for American Archaeology: SAA Style
From the OWL at Purdue University : AP Style
From the Appalachian State University: AP Style Quick Guide
Associated Press Stylebook: PN 4783 A83 2004 at Richmond
The Globe and Mail Style Book: a Guide to Language and Usage: PN 4783 M34 2003 at Surrey