Heinlein, R. A. (1983). Friday. Ballantine Books.
Lua i Stíl Chicago (17ú heag.)Heinlein, Robert Anson. Friday. New York: Ballantine Books, 1983.
Lua MLA (9ú heag.)Heinlein, Robert Anson. Friday. Ballantine Books, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.