APA (7th ed.) Citation

Shapley, H. (1915). A study of the orbits of eclipsing binaries. The Observatory.

Chicago Style (17th ed.) Citation

Shapley, Harlow. A Study of the Orbits of Eclipsing Binaries. Princeton, N.J: The Observatory, 1915.

MLA (9th ed.) Citation

Shapley, Harlow. A Study of the Orbits of Eclipsing Binaries. The Observatory, 1915.

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