National Research Council (USA) Committee on an International Directory of Psychologists, Jacobson, E. H., & Duijker, H. C. J. (1958). International Directory of psychologists, exclusive of the U.S.A. Royal Van Gorcum and Co. ; Hak & Prakke.
Chicago-Zitierstil (17. Ausg.)National Research Council (USA) Committee on an International Directory of Psychologists, Eugene Henry Jacobson, und Hubertus Carl Johannes Duijker. International Directory of Psychologists, Exclusive of the U.S.A. Assen: Royal Van Gorcum and Co. ; Hak & Prakke, 1958.
MLA-Zitierstil (9. Ausg.)National Research Council (USA) Committee on an International Directory of Psychologists, et al. International Directory of Psychologists, Exclusive of the U.S.A. Royal Van Gorcum and Co. ; Hak & Prakke, 1958.