Cita APA (7th ed.)
Tolomeo, C., Copérnico, N., Kepler, J., & Hutchins, R. M. The Almagest / On the Revolutions of the Heavenly Spheres / The Harmonies of the World. Encyclopaedia Britannica.
Cita Chicago (17th ed.)
Tolomeo, Claudio, Nicolás Copérnico, Johannes Kepler, i Robert Maynard Hutchins. The Almagest / On the Revolutions of the Heavenly Spheres / The Harmonies of the World. Chicago, EUA: Encyclopaedia Britannica.
Cita MLA (9th ed.)
Tolomeo, Claudio, et al. The Almagest / On the Revolutions of the Heavenly Spheres / The Harmonies of the World. Encyclopaedia Britannica.
Atenció: Aquestes cites poden no estar 100% correctes.