"The present book is intended to reformulate rather than merely to republish thoughts and ideas previously expressed in German and in French [in the author's Allgemeine staatslehre (1925) ; Théorie générale du droit international public (1928) ; Reine rechtslehre (1934)]" -- Pref.
"Appendix: Natural law doctrine and legal positivism, translated by Wolfgang Herbert Kraus [from Die philosophischen grundlagen der naturrechtslehre und des rechtspositivismus]": p. [389]-446.