APA aipamena

(1970). 1971 Britannica yearbooks of science and the future. Encyclopaedia Britannica.

Chicago Style aipamena

1971 Britannica Yearbooks of Science and the Future. Chicago: Encyclopaedia Britannica, 1970.

MLA aipamena

1971 Britannica Yearbooks of Science and the Future. Encyclopaedia Britannica, 1970.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.