European Congress of Psychology, Drenth, P. J. D., Sergeant, J. A., & Takens, R. J. (1990). European perspectives in psychology: Theoretical -- Psychometrics -- Personality -- Developmental -- Educational -- Cognitive -- Gerontological. John Wiley.
Παραπομπή σε μορφή Chicago (17η εκδ.)European Congress of Psychology, Pieter J. D. Drenth, Joseph A. Sergeant, και R. J. Takens. European Perspectives in Psychology: Theoretical -- Psychometrics -- Personality -- Developmental -- Educational -- Cognitive -- Gerontological. Chichester, England ; New York: John Wiley, 1990.
Παραπομπή σε μορφή MLA (9th εκδ.)European Congress of Psychology, et al. European Perspectives in Psychology: Theoretical -- Psychometrics -- Personality -- Developmental -- Educational -- Cognitive -- Gerontological. John Wiley, 1990.