Zimmermann, R. (1990). The law of obligations: Roman foundations of the civilian tradition. Juta.
Citazione stile Chigago Style (17a edizione)Zimmermann, Reinhard. The Law of Obligations: Roman Foundations of the Civilian Tradition. Ciudad del Cabo: Juta, 1990.
Citatione MLA (9a ed.)Zimmermann, Reinhard. The Law of Obligations: Roman Foundations of the Civilian Tradition. Juta, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.