Kopper, J. M. Correspondence: John M. Kopper. The Garland companion to Vladimir Nabokov.(1995).
Lua i Stíl Chicago (17ú heag.)Kopper, John M. "Correspondence: John M. Kopper." The Garland Companion to Vladimir Nabokov.(1995) .
Lua MLA (8ú heag.)Kopper, John M. "Correspondence: John M. Kopper." The Garland Companion to Vladimir Nabokov.(1995), .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.