Charles S. (University of New South Wales, Canberra, Australia) Newton & Ruhul Amin (University of New South Wales, Canberra, Australia) Sarker 
Optimization Modelling [PDF ebook] 
A Practical Approach

Although a useful and important tool, the potential of mathematical modelling for decision making is often neglected. Considered an art by many and weird science by some, modelling is not as widely appreciated in problem solving and decision making as perhaps it should be. And although many operations research, management science, and optimization