Thank you and please excuse me for replying so late -- too many classes to 
teach these days. Your suggestion is perfect: the resulting LaTeX code is 

```
\usepackage[citestyle=ext-authoryear, bibstyle=ext-authortitle]{biblatex}
```
which exactly what I need. 

All the best,
g

Il giorno lunedì 24 aprile 2023 alle 12:49:55 UTC+2 Julien Dutant ha 
scritto:

> Have you tried not specifying a `biblio-style` YAML key and setting 
> instead:
>
> ``` yaml
> biblatexoptions:
> - bibstyle=ext-authortitle
> - citestyle=ext-authoryear
> ```
>
> From Pandoc's LaTeX template (
> https://github.com/jgm/pandoc-templates/blob/master/default.latex, line 
> 400) you'll see that the command is generated by:
>
>
> \usepackage[$if(biblio-style)$style=$biblio-style$,$endif$$for(biblatexoptions)$$biblatexoptions$$sep$,$endfor$]{biblatex}
>
> Which means that a `biblio-style=XXX` is converted to to the option 
> \usepackage[style=XXX,]{biblatex}, but arbitrary biblatexoptions are 
> reproduced as is.
>
> Best,
> On Sunday, April 23, 2023 at 6:39:00 PM UTC+1 Guido Milanese wrote:
>
>> I have been using pandoc + LaTeX + Biblatex for several years now as my 
>> normal tool for scholarly writing, and I find the biblatex filter really 
>> excellent. For some reasons, the style of a journal requires  a particular 
>> biblatex style "mixture":
>>
>> ```
>> citestyle=ext-authoryear, bibstyle=ext-authortitle
>> ```
>>
>> For a similar use, see e.g. 
>> https://tex.stackexchange.com/questions/433643/customizing-biblatex-authoryear-labels-in-bibliography-and-format-of-editor
>> .
>>
>> Question: while I normally write, in my YAML header:
>>
>> ```
>> biblio-style: <required style>
>> ```
>>
>> I was not able to find a YAML instruction suitable for this particular 
>> need, i.e. two searate style for citation and for the final bibliography. 
>> Not a big issue, since I can edit the TeX file with s simple sed script, 
>> but I was just curious to know if it is possible to incorporate this 
>> instruction within a YAML header.
>>
>> Many thanks for everything.
>> guido (Italy)
>>
>

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