APA (7th ed.) Citation

Bartelmann, M. (2011). Gravitational lensing. Classical and quantum gravity, 27(23), . https://doi.org/10.1088/0264-9381/27/23/233001

Chicago Style (17th ed.) Citation

Bartelmann, Matthias. "Gravitational Lensing." Classical and Quantum Gravity 27, no. 23 (2011). https://doi.org/10.1088/0264-9381/27/23/233001.

MLA (9th ed.) Citation

Bartelmann, Matthias. "Gravitational Lensing." Classical and Quantum Gravity, vol. 27, no. 23, 2011, https://doi.org/10.1088/0264-9381/27/23/233001.