Which figure of speech is used in this text?
Where have you gone, Joe DiMaggio?
A nation turns its lonely eyes to you . . .
—Paul Simon, "Mrs. Robinson"

 - chiasmus
 - apostrophe
The text uses apostrophe, a direct address to an absent person or a nonhuman entity.
Joe DiMaggio is a direct address to former baseball star Joe DiMaggio, an absent person.