Cita APA (7a ed.)
Samuelson, D. N. (Jul93). Modes of Extrapolation: The Formulas of Hard SF. Science Fiction Studies, 20(2), 191-241.
Cita Chicago Style (17a ed.)
Samuelson, David N. "Modes of Extrapolation: The Formulas of Hard SF." Science Fiction Studies 20, no. 2 (Jul93): 191-241.
Cita MLA (9a ed.)
Samuelson, David N. "Modes of Extrapolation: The Formulas of Hard SF." Science Fiction Studies, vol. 20, no. 2, Jul93, pp. 191-241.
Precaución: Estas citas no son 100% exactas.