Burkhardt, S. Poetry and the language of communication: Sigurd Burkhardt. Hopkins : a collection of critical essays.(1966).
Lua i Stíl Chicago (17ú heag.)Burkhardt, Sigurd. "Poetry and the Language of Communication: Sigurd Burkhardt." Hopkins : A Collection of Critical Essays.(1966) .
Lua MLA (8ú heag.)Burkhardt, Sigurd. "Poetry and the Language of Communication: Sigurd Burkhardt." Hopkins : A Collection of Critical Essays.(1966), .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.