# op. cit.

**URL:** <https://discourse.citationstyles.org/t/op-cit/456>\
**Category:** CSL Development\
**Created:** [March 23, 2008, 4:16pm UTC](https://discourse.citationstyles.org/t/op-cit/456 "2008-03-23T16:16:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Bruce\_D\_Arcus1](https://avatars.discourse-cdn.com/v4/letter/b/4bbf92/32.png) [@Bruce\_D\_Arcus1](https://discourse.citationstyles.org/u/Bruce_D_Arcus1)\
**Post date:** [March 23, 2008, 4:16pm UTC](https://discourse.citationstyles.org/t/op-cit/456/1 "2008-03-23T16:16:15Z")

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OK, I really, really hate having to do this, but I think we need to  
add support for op.cite/supra references. From the Zotero forums,  
explaantion fo how it works in Bluebook:

“I think that the biggest additional problem raised by bluebook over  
other styles is that after the first cite, subsequent cites have to  
refer to the footnote number of the first cite. So if an article X is  
first referred to in note 3, the subsequent short form is” X, supra  
note 3." This in turn means that every time the piece is edited and  
the footnote number of the initial reference changes, every subsequent  
supra cite has to change also."

The tricky part is figuring how to specify “note number for first  
occurrence.” If we’re lucky, the solution is already in CSL in the way  
that “number” style citations work, but I’ll need to check.

Bruce