This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
SchmollerGustav. de Gustav von Schmoller deutscher konom vwl unibayreuth de html Sandau Sellin HoffotografenUllstein Bild reflist PDold Gustav Schmoller
Page 2023 Free-images.com. All images are Public Domain