Frey, H. Intertextuality in Celan's poetry: "Zwölf Jahre" and "Auf Reisen" / Hans-Jost Frey. Word traces : readings of Paul Celan.(1994).
Lua i Stíl Chicago (17ú heag.)Frey, Hans-Jost. "Intertextuality in Celan's Poetry: "Zwölf Jahre" and "Auf Reisen" / Hans-Jost Frey." Word Traces : Readings of Paul Celan.(1994) .
Lua MLA (8ú heag.)Frey, Hans-Jost. "Intertextuality in Celan's Poetry: "Zwölf Jahre" and "Auf Reisen" / Hans-Jost Frey." Word Traces : Readings of Paul Celan.(1994), .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.