Cita APA (7th ed.)

Andrews Colin & Wilson Paul. (1993). Foundation. Headline Feature Books Publishing.

Cita Chicago (17th ed.)

Andrews Colin i Wilson Paul. Foundation. London: Headline Feature Books Publishing, 1993.

Cita MLA (9th ed.)

Andrews Colin i Wilson Paul. Foundation. Headline Feature Books Publishing, 1993.

Atenció: Aquestes cites poden no estar 100% correctes.