Harris, J. M., Hirst, J. L., & Mossinghoff, M. J. (2010). Combinatorics and graph theory (2nd ed.). Springer.

Harris, John M., Jeffry L. Hirst, and Michael J. Mossinghoff. Combinatorics and Graph Theory. 2nd ed. New York: Springer, 2010.

Harris, John M., et al. Combinatorics and Graph Theory. 2nd ed. Springer, 2010.