Kelsen, Hans, 1881-1973. Principles of international law / Hans,Kelsen, - 2nd ed. / rev. and edited by Robert W. Tucker. - New York : Holt, Rinehart and Winston, 1967 - xvlll, 602 p. ; 24 cm. Subjects--Topical Terms: International law. Dewey Class. No.: 341 / KEP 1967