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This question already has an answer here:

Why there is no reference-request tag?

I want to ask where can I read about a certain topic.

Are questions like this offtopic?

marked as duplicate by gnat, Thomas Owens Apr 19 '17 at 15:16

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Reference requests are off topic. From our "What topics can I ask about here?" help article:

Some questions, even if they appear to fit into one of the above categories, may still be off-topic or a poor fit for this format:

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The Help Center specifically defines this type of question as off-topic:

Some questions, even if they appear to fit into one of the above categories, may still be off-topic or a poor fit for this format:

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finding or recommending products or services, including tools, libraries or packages, programming languages, books, scholarly papers, tutorials, articles, or blogs

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