By Voodoo, are you referring to the Haitian Religion of Vodou? Originated in Yoruba in Africa.
If this is the case, I have a great friend of mine who I won't include her name here, but she is a well-versed Bokor, a Bokor means a Vodouisant who works with two hands. Her book is not yet released but it is absolutely Fantastic!
Another few authors I suggest, would vary I have found some great authors on Vodou and although I am not a Vodou practitioner, I do understand the religion quite well.
I suggest you watch the Divine Horseman, it's a movie which can be found on YouTube which is an excellent starting point in understanding the Lwa.
I wish you the best of luck in your path,
Dr. Alexander Wilson.