Walker, D., & Lang, P. (2007). The maverick and the machine: Governor Dan Walker tells his story. Southern Illinois University Press.
Chicago-referens (17:e uppl.)Walker, Daniel, och Peggy Lang. The Maverick and the Machine: Governor Dan Walker Tells His Story. Carbondale: Southern Illinois University Press, 2007.
MLA-referens (9:e uppl.)Walker, Daniel, och Peggy Lang. The Maverick and the Machine: Governor Dan Walker Tells His Story. Southern Illinois University Press, 2007.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.