APA (7th ed.) Citation

Courbin, F., & Sluse, D. (2012). Three quasi-stellar objects acting as strong gravitational lenses. Astronomy and astrophysics, 540, . https://doi.org/10.1051/0004-6361/201118015

Chicago Style (17th ed.) Citation

Courbin, Frédéric, and Dominique Sluse. "Three Quasi-stellar Objects Acting as Strong Gravitational Lenses." Astronomy and Astrophysics 540 (2012). https://doi.org/10.1051/0004-6361/201118015.

MLA (9th ed.) Citation

Courbin, Frédéric, and Dominique Sluse. "Three Quasi-stellar Objects Acting as Strong Gravitational Lenses." Astronomy and Astrophysics, vol. 540, 2012, https://doi.org/10.1051/0004-6361/201118015.