APA (7th ed.) Citation

Narayan, R., & Bartelmann, M. (1999). Gravitational lensing. Formation of structure in the universe.

Chicago Style (17th ed.) Citation

Narayan, Ramesh, and Matthias Bartelmann. "Gravitational Lensing." Formation of Structure in the Universe 1999.

MLA (9th ed.) Citation

Narayan, Ramesh, and Matthias Bartelmann. "Gravitational Lensing." Formation of Structure in the Universe, 1999.

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