APA aipamena

(1981). 1981 yearbook of science and the future.

Chicago Style aipamena

1981 Yearbook of Science and the Future. Encyclopaedia Britanica Inc., London, 1981.

MLA aipamena

1981 Yearbook of Science and the Future. 1981.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.