Contribution to an Encyclopedia
            Reinhard Zimmermann, Contract, Damnum iniuria datum, Iniuria and defamation, Locatio conductio, Mandate, Nexum, Obligation, Restitution, Sale, Security, Stipulatio, Theft, in: 
Simon Hornblower, 
Antony Spawforth (eds.), The Oxford Classical Dictionary, 3. ed., Oxford University Press, Oxford 1996, 385-et passim.