Cita APA (7th ed.)
Kalbitzer, H., & Hellmann, H. (1964). Developing Countries and world powers. Europ.Verl.Anst.
Cita Chicago (17th ed.)
Kalbitzer, Hellmut, i Henry Hellmann. Developing Countries and World Powers. Francfort on-Main: Europ.Verl.Anst, 1964.
Cita MLA (9th ed.)
Kalbitzer, Hellmut, i Henry Hellmann. Developing Countries and World Powers. Europ.Verl.Anst, 1964.
Atenció: Aquestes cites poden no estar 100% correctes.