I'm almost ready to turn in my master thesis, but there are some kinks I'm having trouble ironing out. For example, for some mysterious reason article titles are italicized in the bibliography, which is a violation of the APA style. As far as I understand, this should not be happening. A separate question is why my headings in a sans serif font instead of the default, but I've pretty much given up on figuring that one out. Please advise.
MWE:
\documentclass[american, 12pt, a4paper,headsepline,headinclude,oneside,bibliography=totoc]{scrbook}
\usepackage[T1]{fontenc} % T1 fonts für gute pdf-Ausgabe
\usepackage[utf8]{inputenc} % deutsche Umlaute, []
\usepackage[ngerman, USenglish]{babel}
\usepackage[autostyle]{csquotes}
\usepackage[backend=biber,style=apa,citestyle=authoryear, maxcitenames=3{biblatex}
\DeclareLanguageMapping{american}{american-apa}
\DeclareLanguageMapping{german}{german-apa}
\DeclareLanguageMapping{ngerman}{ngerman-apa}
\DeclareFieldFormat[article,unpublished,misc]{title}{\textit{#1}}
\addbibresource{../5Literature/refs.bib}
\begin{document}
Testing APA-style bibliography, citing \cite{rosenstock1974historical} and \cite{abras2004user}.
\printbibliography
\end{document}

articlefrom your\DeclareFieldFormatcommand. – Alan Munn May 03 '17 at 13:06\documentclass[egregdoesnotlikesansseriftitles]{scrbook}– samcarter_is_at_topanswers.xyz May 03 '17 at 13:27\addtokomafont{}{}. – ebosi May 03 '17 at 13:49