Caplan, R. (2009). When is it Right to Fight? German Council on Foreign Relations.
Cita Chicago (17th ed.)Caplan, R. When Is It Right to Fight? German Council on Foreign Relations, 2009.
Cita MLA (9th ed.)Caplan, R. When Is It Right to Fight? German Council on Foreign Relations, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.