Are there any specific time-periods you are interested in? Besides that, I recommend De Boergondiërs by Bart van Loo. In this book van Loo talks about the Burgundians primarily, but while doing so he goes over the history of Belgium and specifically Flanders in the high and late medieval period. This ofcourse because Belgium from this period and the Burgundians are inseperable. He talks about the economy of Flanders with wealthy towns like Brugge and Gent, and their importance during the 100 years war and after. I learned a lot from this book and it actually made me make a trip to Brugge to see all the landmarks for myself.

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