Works by Robert Monroe https://www.amazon.com/Robert-A.-Monroe/e/B000AQ8V5A
Works by Dr. Lilly https://www.amazon.com/Center-Cyclone-Looking-Inner-Space/dp...
Carlos Castanteda (take it with a grain of salt :) https://www.amazon.com/Carlos-Castaneda/e/B000APXVFG/
D. Scott Rogo's "Leaving Body" is good compilation of various techniques https://www.amazon.com/Leaving-Body-D-Scott-Rogo/dp/06717639...
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Works by Robert Monroe https://www.amazon.com/Robert-A.-Monroe/e/B000AQ8V5A
Works by Dr. Lilly https://www.amazon.com/Center-Cyclone-Looking-Inner-Space/dp...
Carlos Castanteda (take it with a grain of salt :) https://www.amazon.com/Carlos-Castaneda/e/B000APXVFG/
D. Scott Rogo's "Leaving Body" is good compilation of various techniques https://www.amazon.com/Leaving-Body-D-Scott-Rogo/dp/06717639...