Belson, W. A. (1986). Validity in survey research: With special reference to the techniques of intensive interviewing and the progressive modification for testing and constructing difficult or sensitive measures for use in survey research. Gower.
Chicago Style aipamenaBelson, William A. Validity in Survey Research: With Special Reference to the Techniques of Intensive Interviewing and the Progressive Modification for Testing and Constructing Difficult or Sensitive Measures for Use in Survey Research. England: Gower, 1986.
MLA aipamenaBelson, William A. Validity in Survey Research: With Special Reference to the Techniques of Intensive Interviewing and the Progressive Modification for Testing and Constructing Difficult or Sensitive Measures for Use in Survey Research. Gower, 1986.