# Biblatex citations inside KOMA-script's dictum [duplicate]

I would like to use biblatex (specifically, biblatex-chicago) to cite an author inside the \dictum command of scrbook.

Here's my MWE, which produces some errors.

\documentclass{scrbook}

\usepackage{lipsum}
\usepackage[authordate,backend=biber]{biblatex-chicago}

\begin{filecontents*}{test.bib}
@book{Marshall1920,
title={Principles of Economics},
subtitle={An Introductory Volume},
author={Marshall, Alfred},
publisher={Macmillan and Co.},
location={London},
edition={8},
date={1920}}
\end{filecontents*}

\begin{document}
\renewcommand*{\dictumauthorformat}[1]{#1}
\setchapterpreamble[u]{\dictum[\textcite[][782]{Marshall1920}]{If we shut our eyes to realities we may construct an edifice of pure crystal by imaginations, that will grow side lights on real problems; and might conceivably be of interest to beings who had no economic problems like our own.}}

I would rather continue using \dictum rather than switching to package epigraph or something similar, if this is possible.
• You probably need an extra pair of braces: \dictum[{\textcite[][782]{Marshall1920}}]{...} (there is a question about this somewhere on tex.sx...) Mar 6 '15 at 14:51