What spiritual reading should one do as an out of body travel explorer?

What spiritual reading should one do as an out of body travel explorer? The Out-of-Body Travel Foundation - https://outofbodytravel.org – Astral Travel and Astral Projection: Download Books, Films, Seminars, Livestreams, Music, Art, Vignettes, Radio and TV Appearances and More on Out-of-Body Experiences. (Ghosts, Reincarnation, Initiations, Heaven, Hell, Angels, Demons.) Out-of-Body Travel Author, Marilynn Hughes (Copyright) Out of Body Travel, Out of Body Experiences, Out of Body, Astral Travel, Astral Projection, Near Death Experiences, Mystical Experiences, OBE, OOBE, NDE