1
by Marshall, John
Published 1969
Documentary Educational Resources (DER)

2
by Gross, Sally-Anne
Published 2018
University of Westminster Press

3
by Marta M. N. Bienkiewicz
Published 2017
Frontiers Media SA

4
by Altmeppen, Klaus-Dieter
Published 2017
Nomos Verlagsgesellschaft mbH & Co. KG