Dyfyniad APA

(1982). 1983: Yearbook of science and the future. Encyclopaedia Britannica.

Dyfyniad Arddull Chicago

1983: Yearbook of Science and the Future. Chicago: Encyclopaedia Britannica, 1982.

Dyfyniad MLA

1983: Yearbook of Science and the Future. Encyclopaedia Britannica, 1982.

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