Daphne Daume...et al & Charles Cegielski. (1989). Yearbook of science and the future. Encyclopaedia Britannica.
Lua i Stíl Chicago (17ú heag.)Daphne Daume...et al agus Charles Cegielski. Yearbook of Science and the Future. Chicago: Encyclopaedia Britannica, 1989.
Lua MLA (9ú heag.)Daphne Daume...et al agus Charles Cegielski. Yearbook of Science and the Future. Encyclopaedia Britannica, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.