Citazione Stile APA (7a Edizione)

Heil, J. (2012). The universe as we find it (1a. ed.). Oxford University Press.

Citazione stile Chigago Style (17a edizione)

Heil, John. The Universe as We Find It. 1a. ed. Oxford: Oxford University Press, 2012.

Citatione MLA (9a ed.)

Heil, John. The Universe as We Find It. 1a. ed. Oxford University Press, 2012.