For a temporary solution It looks like you have to modify Pandoc's LaTeX template. The biblatex manual says that citestyle has to be given as \usepacakge option. 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[$if(cite-style)$citestyle=$cite-style$,$if(biblio-style)$bibstyle=$biblio-style$,$endif$$else$$if(biblio-style)$style=$biblio-style$,$endif$$endif$$for(biblatexoptions)$$biblatexoptions$$sep$,$endfor$]{biblatex}

(This generates `citestyle=<cite-style>,bibstyle=<bibstyle>` if both are present and `sytle=<bib-style>` if the YAML doesn't define a `cite-style`.) You can then add `cite-style: ext-authoryear` to your YAML block and run Pandoc with --template mytpl.latex. You can place the template in your pandoc user directory so it can be used anywhere with --template mytpl.latex, e.g. $HOME/local/share/pandoc on Linux. See https://pandoc.org/MANUAL.html#option--data-dir

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)