Reprinted in The Physical Review - the First Hundred Years, AIP Press (1995) 952.
Selected Papers on Quantum Electrodynamics, editor J. Schwinger, Dover Publications, Inc., New York (1958) 275.

Abstracts
A unified development of the subject of quantum electrodynamics is outlined, embodying the main features both of the Tomonaga-Schwinger and of the Feynman radiation theory. The theory is carried to a point further than that reached by these authors, in the discussion of higher order radiative reactions and vacuum polarization phenomena. However, the theory of these higher order processes is a program rather than a definitive theory, since no general proof of the convergence of these effects is attempted.
The chief results obtained are (a) a demonstration of the equivalence of the Feynman and Schwinger theories, and (b) a considerable simplification of the procedure involved in applying the Schwinger theory to particular problems, the simplification being the greater the more complicated the problem. .

Related references See also S. Tomonaga, Progr. of Theor. Phys. 1 (1946) 27;
E. A. Uehling, Phys. Rev. 48 (1935) 55;
Z. Koba, T. Tati, and S. Tomonaga, Progr. of Theor. Phys. 2 (1947) 101;
Z. Koba, T. Tati, and S. Tomonaga, Progr. of Theor. Phys. 2 (1947) 198;
S. Kanesawa and S. Tomonaga, Progr. of Theor. Phys. 3 (1948) 1;
J. Schwinger, Phys. Rev. 73 (1948) 416;
J. Schwinger, Phys. Rev. 74 (1948) 1439;
R. P. Feynman, Rev. of Mod. Phys. 20 (1948) 367;
R. P. Feynman, Phys. Rev. 74 (1948) 939;
R. P. Feynman, Phys. Rev. 74 (1948) 1430;
J. A. Wheeler and R. P. Feynman, Rev. of Mod. Phys. 17 (1945) 157;
Z. Koba and G. Takeda, Progr. of Theor. Phys. 3 (1948) 205;
W. Heisenberg, Z. Phys. 120 (1943) 513;
W. Heisenberg, Z. Phys. 120 (1943) 673;
W. Heisenberg, Zeit. Naturforschung 1 (1946) 608;
W. Pauli, Rev. of Mod. Phys. 13 (1941) 203;
R. Serber, Phys. Rev. 48 (1935) 49;
S. Tomonaga, Phys. Rev. 74 (1948) 224;

Record comments
Covariant quantum electrodynamics: Equivalence between the Tomonaga-Schwinger method and the Feynman method and generalization.