\documentclass[a4paper,12pt,twoside,headings=big,pointlessnumbers,halfparskip,
tablecaptionabove,liststotoc,bibtotoc]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\usepackage{mdwlist}
\usepackage{siunitx}
\usepackage{setspace}
\usepackage[a4paper]{geometry}
\geometry{width=15.5cm, left=3cm, right=2.5cm, top=2.5cm, bottom=2.5cm, headheight=1cm, footskip=1cm}
\onehalfspacing
\usepackage{tabularx}
\usepackage{graphicx}
\usepackage{rotating}
\usepackage{chngcntr}
\counterwithout{footnote}{section}
\usepackage{booktabs}
\usepackage{longtable}
\usepackage{amstext}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{eurosym}
\usepackage{caption}
\usepackage{tikz}
\usepackage[printonlyused]{acronym}
\setkomafont{sectioning}{\rmfamily\bfseries}
\setkomafont{captionlabel}{\bfseries}
\usepackage[natbib=true,backend=bibtex8,
style=authorstyle,maxnames=2,maxbibnames=8, minbibnames=8, uniquename=init]{biblatex}
\usepackage[babel, german=quotes]{csquotes}
\addbibresource{Literatur.bib}
\DefineBibliographyStrings{ngerman}{andothers={et al.},and={und}}
\DeclareNameAlias{sortname}{last-first}
\setlength{\bibitemsep}{6pt}
\documentclass[a4paper,12pt,twoside,headings=big,pointlessnumbers,halfparskip,
tablecaptionabove,liststotoc,bibtotoc]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\usepackage{mdwlist}
\usepackage{siunitx}
\usepackage{setspace}
\usepackage[a4paper]{geometry}
\geometry{width=15.5cm, left=3cm, right=2.5cm, top=2.5cm, bottom=2.5cm, headheight=1cm, footskip=1cm}
\onehalfspacing
\usepackage{tabularx}
\usepackage{graphicx}
\usepackage{rotating}
\usepackage{chngcntr}
\counterwithout{footnote}{section}
\usepackage{booktabs}
\usepackage{longtable}
\usepackage{amstext}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{eurosym}
\usepackage{caption}
\usepackage{tikz}
\usepackage[printonlyused]{acronym}
\setkomafont{sectioning}{\rmfamily\bfseries}
\setkomafont{captionlabel}{\bfseries}
\usepackage[natbib=true,backend=bibtex8,
style=apa ,maxnames=2,maxbibnames=8, minbibnames=8, uniquename=init]{biblatex}
\usepackage[babel, german=quotes]{csquotes}
\addbibresource{Literatur.bib}
\DefineBibliographyStrings{ngerman}{andothers={et al.},and={und}}
\DeclareNameAlias{sortname}{last-first}
\DeclareLanguageMapping{ngerman}{ngerman-apa}
\setlength{\bibitemsep}{6pt}
Schon mal Danke im Voraus!

