Cita APA (7a ed.)

Woltjer, L. (1968). Galaxies and the Universe. Columbia University Press.

Cita Chicago Style (17a ed.)

Woltjer, Lodewijk. Galaxies and the Universe. New York: Columbia University Press, 1968.

Cita MLA (9a ed.)

Woltjer, Lodewijk. Galaxies and the Universe. Columbia University Press, 1968.