The student is quoting from page 148 of the following magazine article:

Als, Hilton. “Wayward Girl.” The New Yorker, 18-25 Aug. 2003, pp. 147-49.

Als describes Cat Power as “a storyteller . . . [who] cares more about how she says something than about what she says” (148).

Als describes Cat Power as “a storyteller . . . [who] cares more about how she says something than about what she says.” (148)

In MLA style, the parenthetical citation appears after the quoted material and before the sentence period.