"The nature of creativity" was first published in Creativity and its cultivation, Harold H. Anderson, ed. (New York, 1959).
"Creativity and the unconscious" was first published in Voices: the journal of the American Academy of Psychotherapists.
"Creativity and encounter" was first published in The American journal of psychoanalysis XXIV/1.
"The Delphic oracle as therapist" was first published in The reach of mind: assays in memeory of Kurt Goldstein, Marianne L. Simmel ed. (New York, 1968).