APA (7th ed.) Citation

Hopp, U., Wagner, S., & Richtler, T. (1995). The globular cluster system of NGC 5813. Astronomy and astrophysics, 296, .

Chicago Style (17th ed.) Citation

Hopp, Ulrich, Stefan Wagner, and Tom Richtler. "The Globular Cluster System of NGC 5813." Astronomy and Astrophysics 296 (1995).

MLA (9th ed.) Citation

Hopp, Ulrich, et al. "The Globular Cluster System of NGC 5813." Astronomy and Astrophysics, vol. 296, 1995.