System modelling

[niko2000]

Hi,
Recently I have started with learning mathematical system modelling. I seems very interesting so I am looking for books to learn more.
Could anyone recommend some good books or some web address about doing mathematical models for real life systems (engineering, economics, human behavior....)?
Regards,
Niko

[Integral]

I cannot compare it to others, but I have on my shelf,

Mathematics Applied to Deterministic Problems in the Natural Sciences by C.C. Lin & L.A. Segal.

It covers the material you are looking for.