I am trying to format the spacing for my references list so that each entry is single-spaced but it is double-spaced between entries.
Are you using Word's built-in Citations & Bibliography facility? In that case, the bibliography makes use of the Bibliography style which you can customize to suit your needs. In this particular instance, you would want to change the Line Spacing to "Single" and the Spacing Before and Spacing After should both be set to zero (or at least to a small amount).
I do not use this feature and so am unsure of the spacing ordinarily between entries. If Stefan's suggestion does not work, modify the same style to provide a small amount of space after, i.e. 3 pts. The key is in the style.
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