A.M.
Warning!! Danger!!
I KNOW it's hard, when husbands are making so many mistakes, but try REALLY hard not to micromanage your husband's relationship with his stepson, your son. It can seriously backfire and harm their relationship.
I know whereof I speak, so please don't make that mistake. As much as you can tolerate it, if your husband is generally loving toward your son, allow him to parent HIS way, or you will regret it. Mom and Dad can parent differently in some ways, and that is okay.
I love that new quote I just learned from Rae on another question, "unsolicited advice is implied criticism." I think, unless your husband is asking for advice, you should skip giving him a book. He will feel criticized, and possibly start to withdraw from your son.