<sod>There is a question about how to pluralize acronyms. Often a writer will add an 's' following an apostrophe, as in "PC's". However, [[Kate Turabian]], writing about style in academic writings,<ref name="Chicago">Turabian, K., ''A Manual for Writers of Research Papers, Theses, and Dissertations'', 7th Edition, subsection 20.1.2</ref> allows for an apostrophe to form plural acronyms "only when an abbreviation contains internal periods or both capital and lowercase letters". Turabian would therefore prefer "DVDs" and "URLs" and "Ph.D.'s", while the [[Modern Language Association]]<ref name="MLA">Modern Language Association (MLA) Handbook for Writers of Research Papers, 7th Edition 2009, subsection 3.2.7.g</ref> explicitly says, "do not use an apostrophe to form the plural of an abbreviation". Also, the [[American Psychological Association]] specifically says,<ref name="APA">Publication Manual of the American Psychological Association (APA), 5th Edition 2001, subsection 3.28</ref><ref name=autogenerated1>Publication Manual of the American Psychological Association (APA), 6th Edition 2010, subsection 4.29</ref> "without an apostrophe".<eod>
<sod>There is a question about how to pluralize acronyms. Often a writer will add an 's' following an apostrophe, as in "PC's". However, [[Kate Turabian]], writing about style in academic writings,<ref name="Chicago">Turabian, K., ''A Manual for Writers of Research Papers, Theses, and Dissertations'', 7th Edition, subsection 20.1.2</ref> allows for an apostrophe to form plural acronyms "only when an abbreviation contains internal periods or both capital and lowercase letters". Turabian would therefore prefer "DVDs" and "URLs" and "Ph.D.'s". The [[Modern Language Association]]<ref name="MLA">Modern Language Association (MLA) Handbook for Writers of Research Papers, 7th Edition 2009, subsection 3.2.7.g</ref> and [[American Psychological Association]]<ref name="APA">Publication Manual of the American Psychological Association (APA), 5th Edition 2001, subsection 3.28</ref><ref name=autogenerated1>Publication Manual of the American Psychological Association (APA), 6th Edition 2010, subsection 4.29</ref> prohibit apostrophes from being used to pluralize acronyms regardless of periods (so "compact discs" would be "CDs" or "C.D.s"), whereas the ''[[New York Times]]'' style guide requires an apostrophe is necessary when pluralizing all abbreviations regardless of periods (preferring "PC's, TV's and VCR's").<ref>Siegal, AM., Connolly, WG., [https://books.google.com/books?ei=-y5aVHCTyLAEl5GB0AE&id=RT5w0s7_op8C&dq=new+york+times+style&focus=searchwithinvolume&q=plurals+abbreviations ''The New York Times Manual of Style and Usage''], Three Rivers Press, 1999, p. 24.</ref><eod>