Siehr, Kurt MPI for Comparative and International Private Law, Max Planck Society;
https://max-eup2012.mpipriv.de/index.php/International_Commission_on_Civil_Status_(CIEC) (Any fulltext)
Siehr, K. (2012). International Commission on Civil Status (CIEC). In J. Basedow, K. J. Hopt, & R. Zimmermann (Eds.), The Max Planck Encyclopedia of European Private Law (pp. 965-967). Oxford: Oxford University Press.