A-manual-for-writers-of-research-papers-theses-and-dissertations

ABBREVIATIONS. Form plurals of abbreviations without internal periods by adding s alone. Ifthe singular form of the abbreviation ends in a period, put the s before the period. (See 24.1.3on the punctuation of abbreviations.)URLsvols.DVDseds.Add an apostrophe before the s only when an abbreviation contains internal periods or bothcapital and lowercase letters.PhD's (or Ph.D.'s; see 24.2.3)A few abbreviations have irregular plurals (see also 24.7).pp. (plural of p., page)nn. (plural of n., note)If you are writing in the sciences and using abbreviations for units of measure (see 24.5),use the same abbreviation for both the singular and the plural.6 kg37 m 2TERMS IN ITALICS AND QUOTATION MARKS. Form the plural of a term in italics by adding salone (not 's) in roman type. Do not form the plural of a term in quotation marks by adding 's;rephrase the sentence.nottwo Chicago Tribunes. . . included “To be continued” many times. . . included many “To be continued's”20.2 Possessives20.2.1 General RuleForm the possessive of most singular common and proper nouns, including those that end in s,x, or z, by adding an apostrophe and s. This rule also applies to letters and numerals used assingular nouns, and to abbreviations. (Do not confuse possessives with plural forms, whichare described in 20.1). For special cases, see 20.2.2.an argument's effectsStevens's poems2009's economic outlookthe phalanx's advancewww.itpub.net