Markowitz, G. E. (1971). Progressive imperialism: Consensus and conflict in the progressive movement on foreign policy, 1898-1917. University Microfilms.
Chicago-referens (17:e uppl.)Markowitz, Gerald Edward. Progressive Imperialism: Consensus and Conflict in the Progressive Movement on Foreign Policy, 1898-1917. Ann Arbor, Michigan: University Microfilms, 1971.
MLA-referens (9:e uppl.)Markowitz, Gerald Edward. Progressive Imperialism: Consensus and Conflict in the Progressive Movement on Foreign Policy, 1898-1917. University Microfilms, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.