Cita APA (7a ed.)
Clarke, I. F. (1990). From space to time: Footprints in the sands of time. Futures, 22, 515-526.
Cita Chicago Style (17a ed.)
Clarke, I. F. "From Space to Time: Footprints in the Sands of Time." Futures 22 (1990): 515-526.
Cita MLA (9a ed.)
Clarke, I. F. "From Space to Time: Footprints in the Sands of Time." Futures, vol. 22, 1990, pp. 515-526.
Precaución: Estas citas no son 100% exactas.