Frost, R. For once, then, something: Robert Frost. The Northeast.(1979).
Chicago-Zitierstil (17. Ausg.)Frost, Robert. "For Once, Then, Something: Robert Frost." The Northeast.(1979) .
MLA-Zitierstil (8. Ausg.)Frost, Robert. "For Once, Then, Something: Robert Frost." The Northeast.(1979), .
警告：這些引文格式不一定是100％准確.