Hiesinger, H.; Head, J. W.; Wolf, U.; Jaumann, R.; Neukum, G. (2003). „Ages and stratigraphy of mare basalts in Oceanus Procellarum, Mare Numbium, Mare Cognitum, and Mare Insularum“. J. Geophys. Res. 108: 5065. Bibcode:2003JGRE..108.5065H. doi:10.1029/2002JE001985.
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Hiesinger, H.; Head, J. W.; Wolf, U.; Jaumann, R.; Neukum, G. (2003). „Ages and stratigraphy of mare basalts in Oceanus Procellarum, Mare Numbium, Mare Cognitum, and Mare Insularum“. J. Geophys. Res. 108: 5065. Bibcode:2003JGRE..108.5065H. doi:10.1029/2002JE001985.