New Hart's Rules: Oxford Style Guide (author-date)

Hello! When I add several archival documents from the same author and year, the author-date reference in the text does not distinguish between these. There are different documents in the bibliography but there is no way to distinguish which one I refer to in the text (usually it would be NAME 1974a, NAME 1974b, NAME 1974c). Any ideas what to do? Thank you!
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