APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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