My course was taught by a guest lecturer (practicing LA) without the benefit(?) of a text. But I thought he did a relatively good job – what I remembered of the course seemed like a concentrated reduction of the material I found in the Rogers book.
I definitely wouldn’t rely on a single or even multiple books, and I have spoken to some others in similar situations. I’d also contacted my former, former employer to learn more about when he started up the firm. Experience is the best teacher, even if it isn’t your own (and sometimes preferably). 🙂