I'm using my custom version of the CMS note with bibliography. Currently I have it set up so the short footname is formatted as follows:

[CONTRIBUTORS-SHORT] [DATE]: [PAGE].

However, I will be citing lots of declassified documents from the National Archives which don't have authors so the [CONTRIBUTORS-SHORT] field is blank. I want to replace this with the [CALL NUMBER] field instead as this is the standard for citing these documents.

I'm editing the [CONTRIBUTORS-SHORT] macro in the CSL to make it pull up the call number instead of the non-existen author for the document type but don't knnow what to put in there to call this up.

Here's my current code:

<macro name="contributors-short">
<choose>
<if type="document">
<what do I put here?>
</if>

<else>
<names variable="author">
<name form="short" and="text" delimiter=", " />
<substitute>
<names variable="editor"/>
<names variable="translator"/>
</substitute>
</names>
</else>

</choose>
<text macro="recipient-short"/>


Any help would be appreciated. Cheers,

[edit: also, is there any way to choose the example reference types in the Chrom panel at chrome://zotero/content/tools/csledit.xul?]