- DusayJohn M.“Egograms and the Constancy Hypothesis”, Trans. An. J., 2: 3, July 1972.
- BerneEricTransactional Analysis in Psychotherapy, Grove Press, New York, 1961.
- KarpmanStephen B.Presentations to Eric Berne Seminar of San Francisco, 1971.
- KarpmanStephen B.“Options”, Trans. An. J., 1: 1, January 1971.
- Dusay , op. cit.
- BerneEric Presentations to San Francisco Transactional Analysis Seminar, circa 1964.
- KarpmanStephen B.“Fingograms”, Trans. An. J., 3: 4, October 1973.
- KarpmanStephen B.“Fingograms”, Trans. An. J., 3: 4, October 1973.

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