Any good books/resources for Network Sales Engineers more geared towards business and less technical?

Hello fellow network people ! I've recently took my career towards the sales side and I'm looking for a good resource for a Sales Engineer. Most of the books from Cisco and other vendors do a good job of the technical execution of design, but seem to lack high level business use cases. I need to learn what gear to use for certain situations. Current business needs in the networking world. A general guide for upgrading older networks. Comparing and contrasting different vendors and price points. Being cost effective. Any help or guidance is much appreciated! Thanks.