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Author

Alan Vengel

5 books found

Cover of Verkaufs-Garten-Modell

Verkaufs-Garten-Modell

Alan Vengel · First published 2010

Cover of 20 Minutes to a Top Performer

20 Minutes to a Top Performer

Alan Vengel · First published 2009

Cover of Sprout

Sprout

Vengel, Alan A · First published 2004

Cover of Sprout!

Sprout!

Greg Wright, Alan Vengel · First published 2003

Cover of Influence Edge

Influence Edge

Alan Vengel · First published 2000 · Latest edition 2001