Those books look like they're more about the economics and social aspects of art, particularly in a certain context, i.e. the high dollar art world in big cities like NYC or LA. I haven't read them, but that's the impression I get from the synopses. The book I'm recommending is more the ins and outs of starting a career as an artist in general. I don't think you're going to get a realistic idea of how most artists sell their work or just survive by looking only at that context.
Anyway, here's the book I'm talking about: http://www.amazon.com/Starting-Your-Career-Artist-Photographers/dp/158115853X
The authors Wojak and Miller are both artists and have taught at art schools, so they've got experience and have helped students with professional development.