Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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