“Anonymous or Confidentiality in Opinion Survey? (The Selective Aproach for Sampling in Surveys where are Included Delicate Questions)”, Mediterr. J. Soc. Sci., vol. 4, no. 2, p. 593, May 2013, Accessed: Nov. 22, 2024. [Online]. Available: https://www.richtmann.org/journal/index.php/mjss/article/view/243