Otto, P. Multiplying worlds. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Otto, Peter. Multiplying Worlds. Oxford University Press.
Lua MLA (8ú heag.)Otto, Peter. Multiplying Worlds. Oxford University Press.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.