Adding bibliography entry without reference in content

Hi, is it possible to add bibliography entry without the reference field visible in MS Word? Or maybe is there a way to insert the text in word that won’t be visible in the document. The point is that I inserted Excel chart in the Word file and inside the chart is the only place where the reference to the quoted work is made. The chart compares different estimates of X and presents few simple bars entitled: Estimates according to the report by B (date); estimates according to the Report by C (date); Estimates according to the report by f (date). The labels in the chart are the only place where the references to those publications are made. I would like bibliographic details to be present in the documents as the readers may be willing to cross check figures.

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