APA-referens (7:e uppl.)
Wolf, C. (2008). Looking backward and forward: Policy issues in the twenty-first century. Hoover Institution Press.
Chicago-referens (17:e uppl.)
Wolf, Charles. Looking Backward and Forward: Policy Issues in the Twenty-first Century. Stanford, Calif.: Hoover Institution Press, 2008.
MLA-referens (9:e uppl.)
Wolf, Charles. Looking Backward and Forward: Policy Issues in the Twenty-first Century. Hoover Institution Press, 2008.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.