Cita APA (7a ed.)

Williams, K. P. (1934). The calculation of the orbits of asteroids and comets. The Principia Press.

Cita Chicago Style (17a ed.)

Williams, Kenneth P. The Calculation of the Orbits of Asteroids and Comets. Bloomington: The Principia Press, 1934.

Cita MLA (9a ed.)

Williams, Kenneth P. The Calculation of the Orbits of Asteroids and Comets. The Principia Press, 1934.