Vijñāna Bhairava Tantra

The techniques now widely marketed as 'ancient meditation methods' derive from this single text, but their current popularity is a documented twentieth-century phenomenon rather than a continuous ancient practice — reaching Western audiences through one specific 1957 popular paperback and later teaching from an Indian guru's discourses in the 1970s.

Paul Reps, Zen Flesh, Zen Bones (1957); Jaideva Singh's scholarly 1979 edition