Parenting books

Hi so I’ve been separated from my son for 5 years now. He loves me very much and I love him even more but it causes him to cry and cling to me when I leave and then act up the following week when I’m not there with him. I just was wondering if there’s any books I can read to educate myself on how to better deal with things of this nature? I really need advice on parenting a child in general but more so how to help your child deal with being separated from you. Thanks in advance