parentheses - How to format a parenthetical citation in a parenthetical phrase?

Specifically, in APA style. I'm talking about this, for example:

...where there has been a long history (artefacts have been found (Smith, 2006)) of such matters...

Is it okay to have double closing parentheses like so? What's the proper formatting otherwise?

Thanks!

Answer

Try take a look in this article http://blog.apastyle.org/apastyle/2013/05/punctuation-junction-parentheses-and-brackets.html

The author suggests use a bracket inside parentheses to create a double enclosure.