APA   Click to copy
Madden, M. E. E., Leeman, J. R., Root, M. J., & Gainey, S. (2011). Reduced sulfur--carbon--water systems on Mars may yield shallow methane hydrate reservoirs. Planetary and Space Science, 59, 203–206.

Chicago/Turabian   Click to copy
Madden, ME Elwood, JR Leeman, MJ Root, and S Gainey. “Reduced Sulfur--Carbon--Water Systems on Mars May Yield Shallow Methane Hydrate Reservoirs.” Planetary and Space Science 59 (2011): 203–206.

MLA   Click to copy
Madden, M. E. Elwood, et al. “Reduced Sulfur--Carbon--Water Systems on Mars May Yield Shallow Methane Hydrate Reservoirs.” Planetary and Space Science, vol. 59, Pergamon, 2011, pp. 203–06.

@article{madden2011a,
  title = {Reduced sulfur--carbon--water systems on Mars may yield shallow methane hydrate reservoirs},
  year = {2011},
  journal = {Planetary and Space Science},
  pages = {203--206},
  publisher = {Pergamon},
  volume = {59},
  author = {Madden, ME Elwood and Leeman, JR and Root, MJ and Gainey, S}
}