Kelsen, H. (1992). Introduction to the problems of legal theory: A translation of the first edition of the Reine Rechtslehre or Pure theory of law. Clarendon Press ; Oxford University Press.

Kelsen, Hans. Introduction to the Problems of Legal Theory: A Translation of the First Edition of the Reine Rechtslehre or Pure Theory of Law. Oxford [England] : New York: Clarendon Press ; Oxford University Press, 1992.

Kelsen, Hans. Introduction to the Problems of Legal Theory: A Translation of the First Edition of the Reine Rechtslehre or Pure Theory of Law. Clarendon Press ; Oxford University Press, 1992.