Cita APA (7th ed.)
Oppenheim, H. B. (1845). System des Völkerrechts.
Cita Chicago (17th ed.)
Oppenheim, Heinrich Bernhard. System Des Völkerrechts. Frankfurt a.M, 1845.
Cita MLA (9th ed.)
Oppenheim, Heinrich Bernhard. System Des Völkerrechts. 1845.
Atenció: Aquestes cites poden no estar 100% correctes.