Cita APA

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

Chicago Edition Citation

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

Cita MLA

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

Atenció: Aquestes cites poden no estar 100% correctes.