Cita APA (7a ed.)

Crawford, R. T. (1930). Determination of orbits of comets and asteroids. McGraw-Hill Book Company.

Cita Chicago Style (17a ed.)

Crawford, Russell Tracy. Determination of Orbits of Comets and Asteroids. New York: McGraw-Hill Book Company, 1930.

Cita MLA (9a ed.)

Crawford, Russell Tracy. Determination of Orbits of Comets and Asteroids. McGraw-Hill Book Company, 1930.