1
Published 2017
Nomos Verlagsgesellschaft mbH & Co. KG

2
Published 2018
Nomos Verlagsgesellschaft mbH & Co. KG

3
by Hübner, Marion
Published 2018
Peter Lang International Academic Publishing Group

4
by Yamoah, Fred Amofa
Published 2023
MDPI - Multidisciplinary Digital Publishing Institute