citation-style-language/styles — pull request #1144 by zuphilip (2014-09-25 05:41:03+00:00)
Title: Update pnas.csl

Solves https://forums.zotero.org/discussion/40717/style-error-proceedings-of-the-national-academy-of-sciences-of-the-united-states-of-america/#Item_0
and another problem with interpunctation in chapters, see example citation in style repo.