Hartmann, W. K.; Neukum, G. (2001). "Cratering Chronology and the Evolution of Mars". Space Science Reviews. 96: 165–194. Bibcode:2001SSRv...96..165H. doi:10.1023/A:1011945222010.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)
Clifford, S. M. (1993). "A model for the hydrologic and climatic behavior of water on Mars". Journal of Geophysical Research. 98 (E6): 10973–11016. Bibcode:1993JGR....9810973C. doi:10.1029/93JE00225.
Hartmann, W. K.; Neukum, G. (2001). "Cratering Chronology and the Evolution of Mars". Space Science Reviews. 96: 165–194. Bibcode:2001SSRv...96..165H. doi:10.1023/A:1011945222010.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)
Clifford, S. M. (1993). "A model for the hydrologic and climatic behavior of water on Mars". Journal of Geophysical Research. 98 (E6): 10973–11016. Bibcode:1993JGR....9810973C. doi:10.1029/93JE00225.