Παραπομπή APA

Britannica, E. (1972). Britannica year book of science and the future. U.S.A.

Παραπομπή Chicago Style

Britannica, Encyclopaedia. Britannica Year Book of Science and the Future. Chicago: U.S.A, 1972.

Παραπομπή MLA

Britannica, Encyclopaedia. Britannica Year Book of Science and the Future. U.S.A, 1972.