How to change my citation style that brackets become bold

Hallo,

I want to insert bold brackets ( ) into my bibliography reference:

That's what I have:
Schmidt J., and J. Schmidt. (1987). Mining (J. Schmidt, Ed.). E. & F.N. Spon Ltd, London and New York, 300pp., (ISBN: 32345555).

That's what i want:
Schmidt J., and J. Schmidt. (1987). Mining (J. Schmidt, Ed.). E. & F.N. Spon Ltd, London and New York, 300pp., (ISBN: 32345555).

My XML text looks like this:
<bibliography hanging-indent="false">
  <sort>
      <key macro="author-short"/>
      <key variable="issued"/>
   </sort>
   <layout>
      <text macro="author" suffix=". " font-weight="bold"/>
      <date variable="issued" prefix=" (" suffix=")." font-weight="bold">
      <date-part name="year"/>
  </date>

Thanks very much in advance.
Daniel
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