^The National Aeronautics and Space Administration (NASA) / International Astronomical Union (IAU). "MOON – Mare Insularum". USGS Astrogeology Science Center. مؤرشف من الأصل في 2013-12-26.
^To a Rocky Moon: A Geologist's History of Lunar Exploration. Don E. Wilhelms, University of Arizona Press (1993). (ردمك 978-0816510658)
