Biggs, N. (1989). Discrete mathematics (Rev. ed). Clarendon.
Grimaldi, R. P. (2014). Discrete and combinatorial mathematics: an applied introduction (Fifth edition). Pearson Education Limited. https://www.vlebooks.com/vleweb/product/openreader?id=AberystUni&isbn=9781292035994
Liu, C. L. (1985). Elements of discrete mathematics: Vol. McGraw-Hill computer science series (2nd ed). McGraw-Hill.
Wilson, R. J., & Watkins, J. J. (1990). Graphs: an introductory approach: a first course in discrete mathematics. Wiley.
