Any Book on Workflow

[Phani G]

Hi,
 
I am a beginner in workflow. I have done workflow setup for routing the IDOC
errors only. I want to learn more about workflow, and am finding the help
documentation a bit difficult. Can any one tell me if there is a book on
workflow which I can follow to understand from the basics.
 
Regards
PG
 
 
 
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