Study Group on a European Civil Code., Research Group on the Existing EC Private Law., Bar, C. v., Clive, E. M., Schulte-Nölke, H., & Beale, H. G. (2009). Principles, definitions and model rules of European private law draft common frame of reference (DCFR): Draft common frame of reference (DCFR) (Outline ed.). Munich: Sellier, European Law Publishers.

Study Group on a European Civil Code., Research Group on the Existing EC Private Law, Christian von Bar, Eric M. Clive, Hans Schulte-Nölke, and H. G. Beale. Principles, Definitions and Model Rules of European Private Law Draft Common Frame of Reference (DCFR): Draft Common Frame of Reference (DCFR). Outline ed. Munich: Sellier, European Law Publishers, 2009.

Study Group on a European Civil Code., et al. Principles, Definitions and Model Rules of European Private Law Draft Common Frame of Reference (DCFR): Draft Common Frame of Reference (DCFR). Outline ed. Munich: Sellier, European Law Publishers, 2009.