How to obtain link with out being obvious

I have bunch of sites that I have access to and wanted to see how to get links out to another clients site without being too obvious. I want to obtain links from textual content. I know one way is to make the link camouflage with the rest of the content, is there any other methods you good people at BHW know off!

Why would you want to get links without being obvious?

Camouflage will work, but I hope the owners of the sites don’t have tools like Ahref or SEMrush or any backlink checker tools because they will expose the camouflaged links. Another way is to write the URL of the target sites without putting a dot (.) especially if the URL can form a natural sentence.