I've heard great things about Predictable Revenue (https://www.amazon.com/dp/B005ERYEGU https://www.amazon.com/dp/B005ERYEGU) and The Sales Acceleration Formula

I've heard great things about Predictable Revenue (https://www.amazon.com/dp/B005ERYEGU https://www.amazon.com/dp/B005ERYEGU) and The Sales Acceleration Formula (https://www.amazon.com/Sales-Acceleration-Formula-Technology-Inbound-ebook/dp/B00T7Q9E2S https://www.amazon.com/Sales-Acceleration-Formula-Technology...) but haven't read either yet. I think they're focused more on selling products than services, but not 100% sure.