Citazione Stile APA (7a Edizione)

Ptolemaeus, C., Kopernik, M., & Kepler, J. (1996). The almagest: IV-V ; The harmonies of the world : V / Johannes Kepler (2nd ed., 6th print.). Encyclopædia Britannica.

Citazione stile Chigago Style (17a edizione)

Ptolemaeus, Claudius, Mikołaj Kopernik, e Johannes Kepler. The Almagest: IV-V ; The Harmonies of the World : V / Johannes Kepler. 2nd ed., 6th print. Chicago: Encyclopædia Britannica, 1996.

Citatione MLA (9a ed.)

Ptolemaeus, Claudius, et al. The Almagest: IV-V ; The Harmonies of the World : V / Johannes Kepler. 2nd ed., 6th print. Encyclopædia Britannica, 1996.