The first page of Heisenberg's break-through paper on quantum mechanics, published in the Zeitschrift für Physik, 33 (1925), 879-893, received 29 July 1925. This image is reprinted from the facsimile reprint of the paper in Heisenberg, Collected Works/Gesammelte Werke, vol. A1, 382-396.

An English translation of the paper may be found in: B.L. Van Der Waerden, ed. and translator, Sources of Quantum Mechanics (New York: Dover, 1967), 261-276.