Hi imaginedesign,
I'm not quite understand your question, you mean you have a WinJS project created by VS 2012 and now opened with VS 2013, the reference issue happens? Or you simply create a new project with VS 2013 and want to use WinJS 1.0 library?
In VS 2013 the default reference is WinJS 2.0, therefore I think you could modify the 1.0 to 2.0, and in your app manifest,
update the OSMinVersion and OSMaxVersionTested values
to 6.3.0, Take a look at this documentation for more information: http://msdn.microsoft.com/en-us/library/windows/apps/bg182879.aspx
And if you create a new VS 2013 WinJS project and wanna use WinJS 1.0, I don't think its possible, since WinJS 2.0 is the upgrade version of WinJS 1.0, it contains more useful features, to use 2.0 version would be better than 1.0 version.
Best Regards,
--James
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