1. C. Berge, Theory of Graphs and Its Applications, Wiley, New York, 1962.
2. On Kelly's congruence theorem for trees
3. R. G. Busacker and T. L. Saaty, Finite Graphs and Networks, McGraw-Hill, New York, 1965.
4. F. Harary, Graphical Reconstructions, appears in A Seminar on Graph Theory, F. Harary, ed., Holt, Rinehart and Winston, 1967, 18–20.