התפשטות קרקעית הים – הבדלי גרסאות

*'''Encyclopedia of Geology''', Elsevier Academic Press, First edition 2005, {{ISBN |0-12-636380-3}}

*'''Encyclopedia of Volcanoes''', Academic Press, 1999, {{ISBN |0-12-643140-X}}

*Alexander E. Gates, '''A to Z of Earth Scientists''', Facts on File Scientific Library, 2003, {{ISBN |0-8160-4580-1}}