Arguments to treat references in scope
By declaring requests for references out of scope, we discourage some legitimate and - interesting history questions.
History is unusual for H:SE; a large part of history is the examination of sources.
Arguments to treat references as out of scope
References are not answers to questions. An answer to a question should be evaluated and judged based on the answer. If I ask "What are good references for X" and someone replies that "Sujarkama's Economics" is a good source, then everyone should be able to evaluate whether that answer is good or bad. I should not have to read Sujarkama's Economics and discover that it relies on the assumption that one of God's holy laws is that all currency should be in the form of comestibles. (Knowing that, I'll downvote the answer).
Eliminating references constrains questions to those that are accessible to all. Take as an example the original question about IKEA. I would argue that the edited question is superior because the resulting answer should include both a discussion of the history of IKEA design and reference sources where we can learn more. Good Questions get Good Answers. (I have to admit that I edited the question, so I may have some bias in determining that the resulting question is superior.)
Is there precedent? Have we decided this before?
I believe that we've discussed this before, but I didn't find a question that really encapsulated the issue that I believe @lohoris and I were discussing. (At this point let me eat some crow - I may have been party to a discussion on another SE site about requests for references which resulted in a strong consensus that they are out of scope. I have been working from the belief that we had collectively discussed and decided this. So if I could have the crow stir fried with a bit of curry?)
Working with references is not history ( There are some peripheral issues in this question that aren't really relevant.)
Are questions asking for reference material on topic - very nice question and answer, but it never really resolves the issue.
@BartArondson asked for a reference to the history of IKEA. The question as originally phrased explicitly requested references, but in the context of a question about history. Rather than discuss the dilemma in the comments, I asked that the question be moved to this forum, and I've flagged the set of comments as obsolete because I don't believe that they usefully respond to that question - particularly in light of my supper of crow.
Other questions that relate to this and seem relevant