Hey I just bought this book, at the back she gives a great suggested reading list, I encourage you to take a look and pick one that sparks your interest :).
yes I have seen that but as said in question I am looking some mathy and programming of systems,if not that then something different according to the reader liked.
Sterman's "Business Dynamics" may be of interest to you, but it's pricey. You may be able to find a PDF online. Morecroft's "Strategic Modelling and Business Dynamics" is available on Safari Books Online if you have a subscription.