Authors
Robert Hoffmann
Institute of Socio-Economic Geography and Spatial Management, Adam Mickiewicz University in Poznań, Poland
Natalia Hoffmann
Institute of Psychology, Adam Mickiewicz University in Poznań, Poland
© 2018 Robert Hoffmann, Natalia Hoffmann, published by Adam Mickiewicz University
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.