Mae'r 'Oxford Dictionary for Writers & Editors' (ail argraffiad, 2000)
hefyd yn argymell atalnodi a llythrennau bach:
a.m. (Lat.) ante meridiem (before noon) (lower case, points)
p.m. (Lat.) post meridiem (after noon) (not cap., points)
Prys
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J P M Jones MA PhD CChem FRSC
Deon y Gyfadran Addysg - Dean of the Faculty of Education
Trefenai
Ffordd Caergybi
Bangor
Gwynedd
LL57 2PX
tel +44 1248 382955/383013
ffacs +44 1248 383990
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