AM, A.M. am, a.m.
Whichi is the correct one?
The MLA Style Manual and Guide to Scholarly Publishing (3rd edition, 2008 -- section 8.2) calls for lower case and periods -- a.m.
The Chicago Manual of Style (16th edition, 2010 -- section 10.42) also calls for lower case with periods -- a.m.
Garner's Modern American Usage (3rd edition, 2009 -- page 39) tells us there are two acceptable forms -- a.m. (lowercase with periods), or AM (small caps, which I can't reproduce here, and without periods). Garner's says "The lowercase letters are now more common, and with lowercase the periods are standard. But many editiors prefer the look of [smallcaps AM without periods]."
Elsewhere in CMOS, the editors tell us that while the University of Chicago Press has internally standardized on a.m., art directors at other presses often prefer the smallcap version without periods. CMOS urges consistency for all abbreviations throughout the document.
Lewis, where did you find your online information? The online CMOS I referenced is consistent with the print version. Perhaps Chicago has some inconsistency going on.
|link||answered Aug 07 '12 at 15:50 Jeff Pribyl Grammarly Fellow|
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