Rösler, Hannes MPI for Comparative and International Private Law, Max Planck Society;
https://max-eup2012.mpipriv.de/index.php/Consumer_Contracts_(PIL) (Any fulltext)
Rösler, H. (2012). Consumer Contracts (PIL). In J. Basedow, K. J. Hopt, & R. Zimmermann (Eds.), The Max Planck Encyclopedia of European Private Law (pp. 361-365). Oxford: Oxford University Press.