Arne Dietrich, «Functional Neuroanatomy of Altered States of Consciousness», Conscious Cognition, June 12, 2003, pp. 231–56.
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См. одновременно Robert Kegan, The Evolving Self (Cambridge, MA: Harvard University Press, 1982), и Robert Kegan, In Over Our Heads (Cambridge, MA: Harvard University Press, 1994).