XI International Congress of Psychology
Paris, France

[Adapted from: Rosenzweig, M., Holtzman, W., Sabourin, M. & Bélanger, D. (2000). History of the International Union of Psychological Science. Hove, UK: Psychology Press.]

Langfield, H.S. (1948). Twelfth International Congress of Psychology. American Journal of Psychology, 61, 576-579.
Twelfth International Congress of Psychology. (1950). Edinburgh, UK: Oliver & Boyd.