Sources for important people project

My person that I will be doing my project on, assigned by Mr. Percival, is Giovanni Cassini and my sources are as follows

http://www-history.mcs.st-andrews.ac.uk/Biographies/Cassini.html

http://www.space.com/18902-giovanni-cassini.html

http://go.galegroup.com/ps/retrieve.do?sgHitCountType=None&sort=RELEVANCE&inPS=true&prodId=GVRL&userGroupName=fl_sarhs&tabID=T003&searchId=R2&resultListType=RESULT_LIST&contentSegment=&searchType=BasicSearchForm&currentPosition=4&contentSet=GALE|CX2830900805&&docId=GALE|CX2830900805&docType=GALE

http://www.nndb.com/people/258/000095970/
 

http://www.britannica.com/EBchecked/topic/98187/Gian-Domenico-Cassini