Book Recommendations
Full disclaimer the links to the books below are amazon affiliate links and I do get compensated should you purchase them through my link. That said, I am only suggesting books I have read/am in the process of reading and actually believe in/feel confident in recommending.
Manifesting Books
Neville Goddard's The Complete Reader is the BEST VALUE of the four. You're actually getting 10 books in one. Including the two below "Feeling Is the Secret" and "Power Of Awareness".
Neville describes manifesting in a lot of ways and does use a bit of biblical reference and scripture to get his point across but it actually makes sense to me. It's a very different take on the bible and when you approach it the way Neville does it truthfully is eye opening. He discusses a variety of things surrounding manifestation. Many of his 'stories' are not something with any real verification so do understand you're basically taking his word for it. That said if you have already been manifesting consciously a bit, you believe it is a thing, this will prove invaluable to you to help you along your manifesting journey.
E-squared by Pam Grout is more Law of Attraction based which is different from Law of Assumption in some ways but they are similar in a lot of ways as well. The general gist is Law of Assumption deals with your thoughts and imagination entirely Law of Attraction deals with the universe and stuff outside of you as well as you to manifest. Both have there cons and their pros depending on where you are on your spiritual journey. I include this book because it honestly helped me immensely early in my journey trying to manifest consciously.
The book includes 9 do-it-yourself experiments with what to expect for each and the process. I have personally done most of them, but I was sold after only doing the first two. Some criticisms are that the book is just giving your mind things to look for so you're primed to experience them... but I think you'll find if you truly entertain it with an open and curious mind and continuously do the experiments yourself more than once it's more than that.