Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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