I am here trying to understand why http://stackoverflow.com/q/15823425 was closed. I am not contesting, but SE rules tend to go over my head, and as Help us make "Not Constructive" and "Not a Real Question" closures more effective has shown, the NC close reason could be clearer. If I were to choose, I would close the question as a shopping recommendation, but then what if there isn't even such an item in the store (as I think is the case with that particular question)?
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It is a shopping question.
Essentially, any question asking for resources (books, links, libraries) and that is just too general (no real constraints) it a shopping question and the answers would end up be subjective.
At the moment, "Not Constructive" is also for shopping questions.
Additionally, as a deleted comment noted, the second paragraph of the question is inviting discussion - something we specifically do not want.