\mainlanguage[de]
\setupbibtex[database=sample, sort=author]
\setuppublications[alternative=apa, criterium=all] % Show reference numbers in the generated list.
\setupheadtext[de][pus=Quellen]

\starttext

\completecontent
\section{Example}
As \cite[hh2010b] already indicated, bibtex is a \LaTeX-centric program.

\blank[4*big]
\CONTEXT\ \contextmark\ \contextversion

\completepublications
\stoptext
