your example is not very instructive. You might want to spend some time and mess around in the bibfile to make things look properly (the "how published" key seems to be missing from misc). I could get it to run after I have added
There might be other options - this is just a quick shot.
% ConTeXt ver: 2013.01.02 18:19 MKIV
%%% minimal example %%%
\setupinteraction[state=start]
\usemodule[bib]
\usemodule[bibltx]
\setupbibtex[database=sample] % do not to put the reference into a bib file called "sample.bib"
\setuppublications[numbering=yesalternative=myapa-de]
\starttext
\cite[bloom]
\placepublications[criterium=text]
\stoptext
%%% minimal example %%%