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No spaces in abbreviations:
            B.A., A.B., B.Sc., M.A., Ph.D., LL.D., D.Sc., Sc.D., Litt.D.

Plurals add apostrophe plus s:
            B.A.'s, A.B.'s

Avoid using in bylines.

            A master of art
            a master's degree
            master's degrees

In general, do not include titles for honorary degrees awarded to individuals before or after names.