Arthur Avalon (Sir John Woodroffe), The Serpent Power, 3rd rev. edn. (Madras: Ganesh and Co., 1931), p. m, note 2.
Campbell cites Arthur Avalon's The Serpent Power as the foundational English-language source for Tantric subtle-body doctrine, deploying it to support comparative analysis of chakra symbolism alongside Jungian mandala theory.
, The Mythic Image, 1974thesis