Leyens, Patrick C. MPI for Comparative and International Private Law, Max Planck Society;
https://max-eup2012.mpipriv.de/index.php/Rating_Agency (Any fulltext)
Leyens, P. C. (2012). Rating Agency. In J. Basedow, K. J. Hopt, & R. Zimmermann (Eds.), The Max Planck Encyclopedia of European Private Law (pp. 1409-1413). Oxford: Oxford University Press.