Παραπομπή APA

Schoelkopf, D. H. e. (1971). 1972 Britannica yearbooks of science and the future. Encyclopaedia Britannica.

Παραπομπή Chicago Style

Schoelkopf, Dean H ed. 1972 Britannica Yearbooks of Science and the Future. Chicago: Encyclopaedia Britannica, 1971.

Παραπομπή MLA

Schoelkopf, Dean H ed. 1972 Britannica Yearbooks of Science and the Future. Encyclopaedia Britannica, 1971.