Jewish Virtual Library: Zipporah - Brief profile of the wife of Moses, with links to pertinent Torah passages. - http://www.jewishvirtuallibrary.org/jsource/biography/tzipporah.html
Zipporah - A Seventh-Day Adventist perspective on the wife of Moses. - http://www.nisbett.com/people/bp-zipporah.htm
Jewish Encyclopedia: Zipporah - Overview of the wife of Moses from the traditional Jewish perspective, including rabbinic commentary. - http://www.jewishencyclopedia.com/view.jsp?artid=135&letter=Z