Dyfyniad APA

Clarke, A. C. (1958). Profiles of the future an enquiry into the limits of the possible. Harper.

Dyfyniad Arddull Chicago

Clarke, Arthur C. Profiles of the Future an Enquiry into the Limits of the Possible. New York: Harper, 1958.

Dyfyniad MLA

Clarke, Arthur C. Profiles of the Future an Enquiry into the Limits of the Possible. Harper, 1958.

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