Siehr, Kurt MPI for Comparative and International Private Law, Max Planck Society;
https://max-eup2012.mpipriv.de/index.php/Code_Europ%C3%A9en_des_Contrats_(Avant-Projet) (Any fulltext)
Siehr, K. (2012). Code Européen des Contrats. Avant Projet. In J. Basedow, K. J. Hopt, & R. Zimmermann (Eds.), The Max Planck Encyclopedia of European Private Law (pp. 207-210). Oxford: Oxford University Press.