1
by Brazeal, Brian
Published 2004
Privately Published

2
by Lowenthal, Ira P.
Published 1982
Documentary Educational Resources (DER)

3
Published 2012
Open Book Publishers

4
by Petzoldt, Martin
Published 1985
Vandenhoeck & Ruprecht

5
by Pirner, Manfred L.
Published 1999
Vandenhoeck & Ruprecht

6
by Hofmann, Peter
Published 2003
Schöningh

7
by Marshall, John
Published 1969
Documentary Educational Resources (DER)

8
by Reinke, Stephan A.
Published 2010
Vandenhoeck & Ruprecht

9
by Zanfagna, Christina
Published 2017
University of California Press

10
by Thérèse Smith
Published 2015
MDPI AG - Multidisciplinary Digital Publishing Institute

11
Published 2012
Open Book Publishers

12
by Altmeppen, Klaus-Dieter
Published 2017
Nomos Verlagsgesellschaft mbH & Co. KG