The links going to other sites will open in a new browser tab or a new window.
"Learning How to Learn","Knowing How to Know", and "The Commanding Self" all Three by Idries Shah.Great Song: The Life and Teachings of Joe Miller. In addition to reading the information that Joe Miller gives, you can get a taste of him and the way. This is best read with feeling and attuning instead of just intellect. I am not aware of any places you can download or read these for free. Should you find one, please contact and let me know. There are some excerpts from this book on the download page. See Excerpts from the Great Song.
Zen Flesh, Zen Bones: A Collection of Zen and Pre-Zen Writings by Paul Reps and Nyogen Senzaki. You can read a free copy at openlibrary.org/. The direct link to this work is Zen Flesh, Zen Bones. The Centering Practices are on this site.
Zen Dawn In the West and The Three Pillars of Zen. Both of these are by Philip Kapleau. I am not aware of any places you can download or read these for free. Should you find one, please contact and let me know.
The complete works of Samuel Lewis. These are available for free at The Murshid Samuel Lewis Archive. This is a very large selection of works, including some media. By the way, you can find some benefit by reading "In the Garden". While much of this book are writings by SAM, much is also about him. Read with attuning and feeling. You can get a taste of a Real Person.
The complete works of Inayat Khan. These are available for free at the Nekbakht Foundation. His writings (many taken from classes) are very clear. Keep in mind that the was bringing so called Sufi to the west and had to tailor his speech and approach to the attitudes and conditions found there and then. Because of that, many of his statements are ways to connect to the prevalent approaches of that time and place. This is a very large selection of works, including some media.
Following is a short and very incomplete list of some of the writings considered as "sacred texts" or source material of some of the major religions. There is benefit in reading many of these; however it is also full of difficulties. That is because of the nature of the translations. In many cases they no longer represent the work, sayings, or writings of the inspirer. They often tend not to carry forward many of inner meanings. However, that does not mean that they should be disregarded. Much can be gained on many levels by working with these and other similar materials. Care should be given to attempt to attune, especially through the breath, to the intent of the writings and writer. Adequate time, preparation, and patience is needed to do so.