Hofmann, Albrecht W. (November 1988). “Chemical differentiation of the Earth: the relationship between mantle, continental crust, and oceanic crust”. Earth and Planetary Science Letters90 (3): 297?314. Bibcode: 1988E&PSL..90..297H. doi:10.1016/0012-821X(88)90132-X.
Hofmann, Albrecht W. (November 1988). “Chemical differentiation of the Earth: the relationship between mantle, continental crust, and oceanic crust”. Earth and Planetary Science Letters90 (3): 297?314. Bibcode: 1988E&PSL..90..297H. doi:10.1016/0012-821X(88)90132-X.