
Dr. Walter Yealing Evans-Wentz was the first englishman to make it to the Tibetan Lamas, high in the mountaiuns in the early 1900's. He was the first indoctrinated by the Tibetan Lamas at that time. His translation, and interpretation of The Tibetan Book of The Dead is the first also. It is an excellent book, and he was very strict in staying as close to the original text as possible, and yet translate to the english language. He was under the strict guidance of his Lama the entire time.
One excellent text that comes from one of the parent lineages of Shambhala is the Tibetan Book of the Dead, which is basically a preparation for the Bardo, or the "in-between" stages after life. You can read more here: https://en.wikipedia.org/wiki/Bardo_Thodol
There is a vast library of teachings from our senior teachers here: http://shambhala.org/teachings-library/ Plus a bunch of recorded talks by our very controversial founder: https://www.youtube.com/results?search_query=chogyam+trungpa
For Tibetans, the practice of meditation is simply the practice of preparing for death. You are becoming familiar with your mind so you will be able to see through the delusions that arise when your mindstream is no longer attached to a physical body.
Of course, you don't necessarily have to believe in rebirth to find value in these traditions. I have found the community aspects of Shambhala to be quite supportive, even when I had doubts, which in this tradition are expected to be plentiful, and are celebrated.
Happy to answer any questions!
Astavarka Gita : - https://docs.google.com/open?id=1IJWnCEJupB1VHxyheLwnvsnMzxq...
Raja Yoga :- https://docs.google.com/open?id=1b9b6uO51isx8fKfuvDC_ftvaatE...
Tao Te Ching :- https://docs.google.com/open?id=1NbIyjE_phiigwpR-jRlOc0u_n1-...
The above books are not directly related to reincarnation.
On reincanation you can read "tibetan book of the dead"
"...that which clingth not no fall can come. Where no fall cometh, there is rest, and where rest is, there is no keen desire. Where keen desire is not, naught cometh or goeth; and where naught cometh or goeth there is no death, no birth." -GB, TBOTD
"Cutting our chains is marvelous, but also very undesirable, for nobody wants to be free." -CC, The Power of Silence
EDIT: btw yogic flying is for idiots. Those who've practiced meditation for years and those fewer who've reached Nirvana have accessed and gained control enough to manipulate what they call the dharmakaya which is connected to the right temporal lobe I believe (also referred to as the silent mind). Those with this degree of mastery have OOB experiences with great maneuverability.