Cita APA

Clarke, A. C. (1968). The promise of space. New York: Harper & Row.

Chicago Style Citation

Clarke, Arthur C. The Promise of Space. New York: Harper & Row, 1968.

Cita MLA

Clarke, Arthur C. The Promise of Space. New York: Harper & Row, 1968.

Atenció: Aquestes cites poden no estar 100% correctes.