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Is there a listing for the proper punctuation of advanced degrees, i.e. Ph.D. and M.D. , etc.?
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One source says:

Abbreviations of academic degrees (and religious orders) require a period after each element in the abbreviation but no internal space.

B.S.
M.B.A.
Ph.D.
LL.B.
Litt.D.
Ed.D.
B.Ch.E.
B.Arch.
M.Div.
M.D.
D.D.S.
R.N.
S.J.
O.S.B.
S.N.D.

Another source says:

The Chicago Manual of Style (CMS) recommends omitting periods unless required for tradition or consistency.

Examples: BA, BS, MA, MS, PhD
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Nearly all reputable sources I've found state that periods should not be used when abbreviating academic degrees.

Sources for Omitting Periods:

"Do not use periods or spaces in abbreviations composed solely of capital letters... Degree names are a notable exception to the lowercase abbreviation rule."
Purdue Online Writing Lab referencing MLA style

"Do not use periods or spaces in abbreviations of all capital letters..."
Purdue Online Writing Lab referencing APA style

"Do not include punctuation in credentials: MD, PhD."
American Medical Association

"In its most recent edition (16th), Chicago Manual of Style prefers that degrees not be abbreviated with periods."
Ohio State University citing Chicago Manual of Style

"Use abbreviation (without periods) of advanced degree..."
University of Maryland

"Don’t use periods in MD, IV, USA, PhD, etc."
UC Academic Health Center

"When used, do not incorporate periods for the degree abbreviations (i.e., "PhD" instead of "Ph.D.")."
Tulane University

"Do not use periods in PhD, BS, MBA, etc."
Northwestern University

Sources for Using Periods:

"Note periods (B.A., B.S., M.S.W., Ph.D., M.A., M.S., M.Div.)."
Asbury University

Can I write PHD?