APA
Harris J. M., Hirst J. L., Mossinghoff M. J. & Undergraduate texts in mathematics. (2008). Combinatorics and graph theory. New York: Springer.
Chicago
Harris John M, Hirst Jeffry L, Mossinghoff Michael J and Undergraduate texts in mathematics. 2008. Combinatorics and graph theory. New York: Springer.
Harvard
Harris J. M., Hirst J. L., Mossinghoff M. J. and Undergraduate texts in mathematics. (2008). Combinatorics and graph theory. New York: Springer.
MLA
Harris John M, Hirst Jeffry L, Mossinghoff Michael J and Undergraduate texts in mathematics. Combinatorics and graph theory. New York: Springer. 2008.