There are reviews of some books here, you can find them by doing a search or by looking in the new collectors area.
There are some 'cheaper' books on lugers out there and they are good as primers, but have inaccurate information.
Decide the era & type you want, WW1, commercial, Weimar, nazi, army, police, navy...
Welcome to the forum, I changed your title and made it so you'll receive emails from responses.
Ed