Here are some of the best reference books that I have found relating to finding legitimate Publishers to submit your work to.
I’ve organised them based on their country focus:-
America / Canada
Why I would recommend this book:- Herman has created an encyclopedic how-to on getting out of the slush pile, getting read, and getting published. Herman’s insights are trusted by agents and editors as well as by the many successful authors who have utilized his strategies. There are nearly 700 U.S. and Canadian publishers in the 2017 version, which makes it an excellent purchase if you live in the US or Canada and are searching for the right publisher for you.
Get it on Amazon here:-