prediction tools are very expensive… I would strongly recommend products from alcatel-lucent (9955 RNP) or from Forsk (Atoll). I don’t know the others, but these 2 are great (and more than that !!)
about documents, i would recommend you to dig into the IEEE database, but you need to register. Maybe your company has already a registration there, so you don’t need to pay anything. But if they don’t they you might want to consider paying it. It very worthwhile.
You will find an incredible amount of studies about radio coverages (among others).