Bradbury, J. M. Warren as Poet: John M. Bradbury. Robert Penn Warren's "Brother to Dragons" : a discussion.(1983).
Chicago-referens (17:e uppl.)Bradbury, John M. "Warren as Poet: John M. Bradbury." Robert Penn Warren's "Brother to Dragons" : A Discussion.(1983) .
MLA-referens (8:e uppl.)Bradbury, John M. "Warren as Poet: John M. Bradbury." Robert Penn Warren's "Brother to Dragons" : A Discussion.(1983), .
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.