Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.