APA (7 वां संस्करण) प्रशस्ति पत्र

Harper, M. M. Versions of History and Brother to Dragons: Margaret Mills Harper. Robert Penn Warren's "Brother to Dragons" : a discussion.(1983).

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Harper, Margaret Mills. "Versions of History and Brother to Dragons: Margaret Mills Harper." Robert Penn Warren's "Brother to Dragons" : A Discussion.(1983) .

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Harper, Margaret Mills. "Versions of History and Brother to Dragons: Margaret Mills Harper." Robert Penn Warren's "Brother to Dragons" : A Discussion.(1983), .