Harper, M. M. Versions of History and Brother to Dragons: Margaret Mills Harper. Robert Penn Warren's "Brother to Dragons" : a discussion.(1983).
Chicago-Zitierstil (17. Ausg.)Harper, Margaret Mills. "Versions of History and Brother to Dragons: Margaret Mills Harper." Robert Penn Warren's "Brother to Dragons" : A Discussion.(1983) .
MLA-Zitierstil (8. Ausg.)Harper, Margaret Mills. "Versions of History and Brother to Dragons: Margaret Mills Harper." Robert Penn Warren's "Brother to Dragons" : A Discussion.(1983), .
警告：這些引文格式不一定是100％准確.