Nathans, Sydney. To Free a Family. The Journey of Mary Walker. Boston: Harvard University Press, 2012. Web. Retrieved 24 May. 2013, from http://www.degruyter.com/view/product/184602

Nathans, S. (2012). To Free a Family. The Journey of Mary Walker. Boston: Harvard University Press. Retrieved 24 May. 2013, from http://www.degruyter.com/view/product/184602

Nathans, Sydney. 2012. To Free a Family. The Journey of Mary Walker. Boston: Harvard University Press. Retrieved 24 May. 2013, from http://www.degruyter.com/view/product/184602