Social-Media-Kommunikation Entlang der Customer JourneyGregor Hopf · First published 2021Open the Tome
Online-Marketing-IntelligenceDennis Ahrholdt, Goetz Greve, Gregor Hopf · First published 2019Open the Tome
Saving and Investment : The Economic Development of Singapore 1965-99Gregor Hopf · First published 2009Open the Tome
