Dyfyniad APA

Asimov, I. (1989). Asimov`s chronology of science and discovery.

Dyfyniad Arddull Chicago

Asimov, Isaac. Asimov`s Chronology of Science and Discovery. London, Gafton Books, 1989.

Dyfyniad MLA

Asimov, Isaac. Asimov`s Chronology of Science and Discovery. 1989.

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