APA (7th ed.) Citation

Moulton, F. R. (1920). Periodic orbits. Carnegie Institution of Washington.

Chicago Style (17th ed.) Citation

Moulton, Forest Ray. Periodic Orbits. Washington: Carnegie Institution of Washington, 1920.

MLA (8th ed.) Citation

Moulton, Forest Ray. Periodic Orbits. Carnegie Institution of Washington, 1920.

Warning: These citations may not always be 100% accurate.