IMO, there's a reason your source has chosen "grønspættebog" instead of the usual suspects. It has to do with the implied content of what we in America might call a "field guide" in this context. I refer to the implication that such a resource has practical, ready-to-use and accessible answers for real life problems. See the reference link below for examples from a Google search for "field guide" + "leadership".

For the Danish origin, see http://da.wikipedia.org/wiki/Grønspættebogen. The English origin of the Danish term goes back of course to the Junior Woodchucks: http://en.wikipedia.org/wiki/Junior_Woodchucks_Guidebook.

Using just "manual" here strikes me as inadequate for what the writer is trying to convey.




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Note added at 1 hr (2010-04-10 02:27:28 GMT)
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Looks like ProZ balked at my link for the origin of "Grønspættebogen". Try this: http://tinyurl.com/yyjgjuy