Cita APA (7a ed.)

Birney, D. S. (1971). Modern astronomy. Allyn and Bacon.

Cita Chicago Style (17a ed.)

Birney, D. Scott. Modern Astronomy. Boston: Allyn and Bacon, 1971.

Cita MLA (8a ed.)

Birney, D. Scott. Modern Astronomy. Allyn and Bacon, 1971.