If you're writing an article or any other paper, make sure you format it according to the style, recognized in the area the paper supposed to appear. For example, the following styles are available in Microsoft Word 2007
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APA - American Psychological Association
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GB7714
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GOST - Russian style
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ISO 690 - ISO standard for bibliographic referencing in documents
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MLA - Style Manual and Guide to Scholarly Publishing
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SIST02
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Turabian
If you're writing a technical paper, you can stick with either Harvard or APA style.
Since Microsoft Word 2007 does not support Harvard reference style by default, here is a project on CodePlex site which provides XML extensions for Microsoft Word 2007 to enable the support for several styles commonly used in colleges and universities.