Ohlsson, Thomas. “Scientific Evidence Base for Transactional Analysis in the Year 2010 Annex 1 – the Big List: References to Transactional Analysis Research 1963- 2010”. International Journal of Transactional Analysis Research & Practice, vol. 1, no. 1, July 2010, pp. 12-23, doi:10.29044/v1i1p12.