Ben & Jerry's Marketing Research, http://yudhaccess.50webs.com/Global%20Pdf%20Year%202/Ben%20&%20Jerry%20Marketing%20Research%20Questionaire.pdf
Smart Service Design, http://s3.amazonaws.com/SurveyMonkeyFiles/SmartSurvey.pdf
Questionnaire Design, http://www.b2binternational.com/b2b-blog/ebook/questionnaire-design-chap1.pdf