Seen on AOL.com:
Sigh. The apostrophe in Who’s is like a little i [Who is?]. So AOL’s question is really asking, “Who is Historic Bible Will Obama Use at Inauguration?“
Doesn’t make sense. The word needed here is whose: “Whose Historic Bible Will Obama Use at Inauguration?“
Possessive pronouns don’t have apostrophes. Guess what: You already knew that! You don’t put an apostrophe into his, do you? Of course not.
All those possessive (ownership) pronouns work the same way: his, hers, its, yours, hers, ours, theirs…and whose.
To learn more about pronouns, click here.