Lua APA (7ú heag.)
Asimov, I. (1953). 2nd Foundation: Galactic Empire. Avon Books.
Lua i Stíl Chicago (17ú heag.)
Asimov, Isaac. 2nd Foundation: Galactic Empire. Nueva York, EUA: Avon Books, 1953.
Lua MLA (9ú heag.)
Asimov, Isaac. 2nd Foundation: Galactic Empire. Avon Books, 1953.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.