There is no on/off switch for the brackets. Your choices are to either keep
them, or remove them altogether. If you want to remove them for all
instances, you will have to edit the style by hand.
The short version:
http://bibword.codeplex.com/wikipage?title=FAQ
(especially 6 and 8 are useful)
The long version (in case you don't know XSL):
The styles are located in the
<winword.exe>\Bibliography\Style
directory. Assuming a normal 32-bit OS with a default Office 2007
installation, that directory is
C:\Program Files\Microsoft Office\Office12\Bibliography\Style
The style you want to edit is located in APA.XSL. Create a copy of the file
and name it MyAPA.XSL. Open the file with a text editor (notepad, ...) and
look for the following lines:
<xsl:when test="b:OfficeStyleKey">
<xsl:text>APA</xsl:text>
</xsl:when>
and change it to
<xsl:when test="b:StyleName">
<xsl:text>APA without brackets</xsl:text>
</xsl:when>
Now when you start Word, there will be an extra style in the dropdown list,
labeled "APA without brackets".
Next you want to remove the brackets. Look for
<xsl:if
test="msxsl:node-set($ListPopulatedWithMain)/b:Citation/b:FirstAuthor">
<xsl:call-template name="templ_prop_OpenBracket"/>
</xsl:if>
and remove it. This will remove the opening bracket. Then look for
<xsl:if test="/b:Citation/b:LastAuthor">
<xsl:call-template name="templ_prop_CloseBracket"/>
</xsl:if>
and remove it. This will remove the closing bracket. You should be all set
now.
Yves