Possessives and Attributives
Q. When indicating possession of a word that ends in s, is it correct to repeat the s after using an apostrophe? For example, which is correct: “Dickens’ novel” or “Dickens’s novel”?
A. Either is correct, though CMOS 15 recommends the latter. Please consult 7.18–22 for a full discussion of the rules for forming the possessive of proper nouns, including exceptions and examples. For a simpler statement of the rule, see paragraph 5.26. For a discussion of the alternative practice of simply adding an apostrophe to form the possessive of proper nouns ending in s, see paragraph 7.23.
