(1) LZ Digital user survey 2022, target group retail, Karwath Marktforschung, Oldendorf.
(2) LZ Digital user survey 2022, target group retail, Karwath Marktforschung, Oldendorf.
(3) Piwik PRO, evaluation of visitors per week, 01.01.2024 - 30.04.2024
(4) IVW, April 2024