Cita APA (7a ed.)

Brown, E. W., & Shool, C. A. (1933). Planetary theory. University Press.

Cita Chicago Style (17a ed.)

Brown, Ernest W., y Clarence A. Shool. Planetary Theory. Cambridge: University Press, 1933.

Cita MLA (9a ed.)

Brown, Ernest W., y Clarence A. Shool. Planetary Theory. University Press, 1933.