No reading dilettante

This book contains various foreign historians who each give their vision, that eye Persian is interesting. By cons, all have to be limited to a chapter and then must return to their most complete work. This mandatory brevity is sometimes frustrating, we would have liked a particular author develops his thesis further.
In short I often had the feeling that this book is to be considered as a summary referring to authors / historians that allow us to discover their theses in this item.
This book is not intended for a reading as a hobby but to a public wishing to open up the theses of foreign historians.