International Congress of Applied Psychology Liège, International Association of Applied Psychology, & Piret, R. (1972). Actes. Proceedings. Editest.
Chicago-viite (17. p.)International Congress of Applied Psychology Liège, International Association of Applied Psychology, ja Roger Piret. Actes. Proceedings. Bruxelles: Editest, 1972.
MLA-viite (8. p.)International Congress of Applied Psychology Liège, et al. Actes. Proceedings. Editest, 1972.
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