Consultative Committee for the Basic Law of the Hong Kong Special Administrative Region, The Basic Law of the Hong Kong Special Administrative Region of the People's Republic of China… (1989)
“ The questionnaire for a sample survey is usually not disclosed to the public in order to minimize the influence of the public opinion on the respondents' emotions; whereas a referendum is the submission of a simple and publicly known issue to the direct vote of the eligible voters after discussion, propaganda or agitation among the public. The problems involved in a referendum are completely different from those in a sample survey. ”
