Zimmerman, R. (1990). The law of obligations: Roman foundations of the civilian tradition. Juta.
Cita Chicago (17th ed.)Zimmerman, Reinhard. The Law of Obligations: Roman Foundations of the Civilian Tradition. Cape Town: Juta, 1990.
Cita MLA (9th ed.)Zimmerman, Reinhard. The Law of Obligations: Roman Foundations of the Civilian Tradition. Juta, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.