References:
Cloud, Preston. 1988. Oasis in Space. New York: W. W. Norton Company. 508 pp.
Levin, Harold L. 1996. The Earth through Time, sixth edition. Philadelphia: Saunders College Publishing. 568 pp.
Wicander, Reed, and James S. Monroe. 2000. Historical Geology: Evolution of the Earth and Life through Time, third edition. Pacific Grove, California: Brooks/Cole. 580 pp.

Links:
Hadean Time http://www.ucmp.berkeley.edu/precambrian/hadean.html
Early Continents http://www.carlzimmer.com/articles/1999/articles_1999_1.html