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1
by Swartz, Greg
Published 2008
ASTD Press
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2
by Bailyn, Evan
Published 2011
Que
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3
by White, Ron
Published 2008
Que Pub.
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4
by Matthes, Gabriele, Garczorz, Henriette
Published 2019
Springer Fachmedien Wiesbaden
“... beständig. Es gibt verschiedene Ansätze zur Professionalisierung, indes keine verbindlichen Standards oder...”