Pattern Recognition (Theodoridis and Koutroumbas) is listed as required. However, any of several other books can be used instead. Here are some:

Fukunaga, K., Introduction to Statistical Pattern Recognition

Duda, R. and Hart, P., Pattern Classification and Scene Analysis, Wiley, 1974.

Duda, R., Hart, P., and Stork, D., Pattern Classification, Second Edition, Wiley, 2001.

Breiman, L., Classification and Regression Trees, Wadsworth, 1984.