APA (7th ed.) Citation

Hirt, C., Claessens, S., Kuhn, M., & Featherstone, W. (2011). Kilometer-resolution gravity field of Mars: MGM2011. Elsevier.

Chicago Style (17th ed.) Citation

Hirt, Christian, Sten Claessens, Michael Kuhn, and Will Featherstone. Kilometer-resolution Gravity Field of Mars: MGM2011. Elsevier, 2011.

MLA (9th ed.) Citation

Hirt, Christian, et al. Kilometer-resolution Gravity Field of Mars: MGM2011. Elsevier, 2011.