For my entire career I've been involved with startups. For the last 15 years I've been advising them around capital formation and M&A. There are a great many books on raising venture capital. But most startups are unsure how best to approach M&A. This book (which I believe is the first book on the topic) is my comprehensive approach to startup M&A - Magic Box Paradigm.
If you're in startups I'd give it a look (it's not textbook, instead a short and fun read). I hope you enjoy.