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A girl asks her mother why she can't keep a catalogue and is told:

> 「明日の午後に私もお歳暮を買いに行くから、 **それの参考にするの** っ。」  
>  I'm going to buy the year end presents tomorrow afternoon, so I'll use that
> (catalogue) as a reference.

How should I parse the part in bold? Why is it not それ **が** 参考にするの

I'm familiar with the idea of replacing が with の in relative clauses to move
the emphasis away from the thing marked by が. But, the only way I can make a
relative clause is if the の at the end of the sentence is something other than
the explanatory の, which seems unlikely. What am I failing to understand?
CC BY-SA 3.0
2016-03-13T10:51:18.470
32881
2016-03-13T15:33:02.883
7944
question
grammar particle-の relative-clauses
Changing が to の outside of relative clauses
I think Aは(が)Bを参考にする is translated as A consult(refer to) B like 私はこの本を参考にした(
I referred to this book).

I think AはCをBの参考にする is translated as "A refer to C for B" like
私は、この絵を、私の絵の参考にする( I refer to this picture for my picture).
CC BY-SA 3.0
2016-03-13T15:33:02.883
32885
2016-03-13T15:33:02.883
7320
32881
answer