This is BibTeX, Version 0.99cThe top-level auxiliary file: normalityAD.aux
The style file: plainnat.bst
Illegal, another \bibstyle command---line 52 of file normalityAD.aux
 : \bibstyle
 :          {plainnat}
I'm skipping whatever remains of this command
Database file #1: refPCSn.bib
(There was 1 error message)