Pißler, Knut Benjamin MPI for Comparative and International Private Law, Max Planck Society;
https://max-eup2012.mpipriv.de/index.php/Sales_(Forms_of_Distribution) (Any fulltext)
Pißler, K. B. (2012). Sales (Forms of Distribution). In J. Basedow, K. J. Hopt, & R. Zimmermann (Eds.), The Max Planck Encyclopedia of European Private Law (pp. 1512-1513). Oxford: Oxford University Press.