Survey references
- Susan Farrell. "Open-Ended vs. Closed-Ended Questions in User Research". Last modified May 22, 2016. https://www.nngroup.com/articles/open-ended-questions/
- Wikipedia. "Closed-ended question". Last modified 15 June 2017. https://en.wikipedia.org/wiki/Closed-ended_question
- Wikipedia. "Open-ended question". Last modified 27 November 2016. https://en.wikipedia.org/wiki/Open-ended_question
- Bert Markgraf. "Short-Term, Medium-Term & Long-Term Planning in Business". http://smallbusiness.chron.com/shortterm-mediumterm-longterm-planning-business-60193.html
- Chris Thelwell. "How to quickly create a powerful survey". https://www.invisionapp.com/blog/how-to-create-a-survey/
- Gerald Linda. Guerrilla Marketing Research: Marketing ...
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