HIPP stands for Historical situation, Intended audience, Purpose, and Point of view. The sourcing point isn't earned by identifying these facts about a document - it's earned by explaining why they matter to your argument.
"...(Doc A, Doc C, Doc D)..."
Parenthetically citing documents by letter doesn't earn this point - you have to explain, for at least two documents, how the author's background, purpose, or intended audience shaped what they wrote and why that matters to your argument.
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