APA (7th ed.) Citation

Moulton, F. R., Buchanan, D., Buck, T., Griffin, F. L., Longley, W. R., & MacMillan, W. D. (1920). Periodic orbits. Carnegie institution of Washington.

Chicago Style (17th ed.) Citation

Moulton, Forest Ray, Daniel Buchanan, Thomas Buck, Frank Loxley Griffin, William Raymond Longley, and W. D. MacMillan. Periodic Orbits. Washington: Carnegie institution of Washington, 1920.

MLA (9th ed.) Citation

Moulton, Forest Ray, et al. Periodic Orbits. Carnegie institution of Washington, 1920.