APA (7th ed.) Citation

Breckinridge, J. B., Kron, G. E., & Paczyński, B. (1963). Photometry of stars in NGC 6231. [Selbstverl.].

Chicago Style (17th ed.) Citation

Breckinridge, Jim B., Gerald E. Kron, and Bohdan Paczyński. Photometry of Stars in NGC 6231. Mount Hamilton, Calif: [Selbstverl.], 1963.

MLA (9th ed.) Citation

Breckinridge, Jim B., et al. Photometry of Stars in NGC 6231. [Selbstverl.], 1963.