A concise guide to market research, c2011: t.p. (Marko Sarstedt) verso t.p. (Prof. Marko Sarstedt, Ludwig-Maximilians-University, Institute for Market-based Management)

profile, viewed 1 May 2021: (Prof. Dr. Marko Sarstedt Faculty of Economics and Management) https://www.marketing.ovgu.de/marketing/en/Team/Head+of+the+Chair-p-966.html