New Post: Word 2013 - Specify Pages in Citiations

I tried to use BibWord, but I have a Problem in Word 2013. With the Word 2013 Styles I can specify the pages in citations. As soon as I Change the style to one which is created with BibWord, the appropriate menu button disappears:



How can I activate These Buttons in BibWord Styles?

Thank you for an answer