Simone de Beauvoir -- The Ethics of Ambiguity (amazon)
Carl Gustav Jung -- Memories, Dreams, Reflections (amazon)
Carl Jung, Richard Wilhelm -- The Secret of the Golden Flower: A Chinese Book of Life (amazon)
Robert Moss -- Sidewalk Oracles: Playing with Signs, Symbols, and Synchronicity in Everyday Life (amazon)
Brian Sutton-Smith -- The Ambiguity of Play (amazon)
