Sources Biography 3

* "Henrietta Swan Leavitt." Science and Its Times. Ed. Neil Schlager and Josh Lauer. Vol. 6: 1900 to 1949. Detroit: Gale, 2000. 506. Gale Virtual Reference Library. Web. 20 Feb. 2015.

                    http://go.galegroup.com/ps/i.doid=GALE%7CCX3408503777&v=2.1&u=fl_sarhs&it=r&p=GVRL&sw=w&asid=e1e1effd2053ce989d71dfeaa5b3fe05

*"Leavitt, Henrietta Swan." Complete Dictionary of Scientific Biography. Vol. 8. Detroit: Charles Scribner's Sons, 2008. 105-106. Gale Virtual Reference Library. Web. 20 Feb. 2015.

http://go.galegroup.com/ps/i.doid=GALE%7CCX2830902515&v=2.1&u=fl_sarhs&it=r&p=GVRL&sw=w&asid=1ff5a124dcae89be547b1ffc1832aad4

*http://www.pbs.org/wgbh/aso/databank/entries/baleav.html

*https://cosmology.carnegiescience.edu/timeline/1912