APA (7th ed.) Citation

Bartelmann, M., & Narayan, R. (2008). Gravitational lensing and the mass distribution of clusters. Dark matter.

Chicago Style (17th ed.) Citation

Bartelmann, Matthias, and Ramesh Narayan. "Gravitational Lensing and the Mass Distribution of Clusters." Dark Matter 2008.

MLA (9th ed.) Citation

Bartelmann, Matthias, and Ramesh Narayan. "Gravitational Lensing and the Mass Distribution of Clusters." Dark Matter, 2008.

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