Newton, H. (1978). Sleepless nights. Schirmer-Mosel.
Lua i Stíl Chicago (17ú heag.)Newton, Helmut. Sleepless Nights. München: Schirmer-Mosel, 1978.
Lua MLA (8ú heag.)Newton, Helmut. Sleepless Nights. Schirmer-Mosel, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.