The perception of door-knocks in terms of authority and urgency


  • Contributions of a theoretical nature were made by Prof. Dr. T. Bums, Dr. G. B. Cohen, Mr. A. Dirks, Dr. W. H. Groffen, Miss M. Habets, Mr. H. F. A. Schalken, and Dr. E. O. Schild. The research was performed with help of Mr. J. Berg, Mr. A. J. M. Overtoom, Mrs. A. J. E. Van Utteren-Christophersen, and the staff of the electronic and film departments of the University.

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