APA (7th ed.) Citation

Williams, K. P. (1934). The calculations of the orbits of asteroids and comets. The Principia press, inc..

Chicago Style (17th ed.) Citation

Williams, Kenneth P. The Calculations of the Orbits of Asteroids and Comets. Bloomington, Ind.: The Principia press, inc., 1934.

MLA (9th ed.) Citation

Williams, Kenneth P. The Calculations of the Orbits of Asteroids and Comets. The Principia press, inc., 1934.