ebrary, Inc, & Madden, D. (2000). The legacy of Robert Penn Warren. Louisiana State University Press.
Lua i Stíl Chicago (17ú heag.)ebrary, Inc, agus David Madden. The Legacy of Robert Penn Warren. Baton Rouge: Louisiana State University Press, 2000.
Lua MLA (9ú heag.)ebrary, Inc, agus David Madden. The Legacy of Robert Penn Warren. Louisiana State University Press, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.