LaTeX Forum

\documentclass[pdftex,a4paper,11pt,twoside]{scrartcl} 
\usepackage[style=authoryear]{biblatex}
\bibliography{DA_references}
\begin{document}
\section{Introduction}
Text text text... are frequently postulated \parencite{Huer03}. There are... Text text text 
\section{Theory}
A lot of scientists have been working on theories (i.g. \cite{Crud96} and \cite{Hung05}) and influencing factors, including text text text.
\end{document}

@incollection{Crud96,
  author = (Cruden, David M.; Varnes, David J.},
  editor = {Turner, A. Keith},
  editora = {Schuster, Robert L.}
  title = {Landslide Types and Processes},  
  booktitle = {Landslides: investigation and mitigation},
  year/date = 1996,
  puplisher = {},
  location = {}
}
@article{Huer03,
  author = {Huerlimann, M.; Rickenmann, D.; Graf, C.},
  title = {Field and monitoring data of debris-flow events in the Swiss Alps},
  journaltitle = {Canadian Geotechnical Journal},
  volume = {40},
  number = {},
  year = 2003,
  pubstatedoi = {10.1139/T02-087},
  size = {Online-Ressource},
  pages = {161-175},
  url = {},
}
@incollection{Hung05,
  author = (Hungr, Oldrich},
  editor = {Jakob, Matthias; Hungr, Oldrich},
  title = {Classification and terminology},
  booktitle = {Debris-flow Hazards and Related Phenomena},
  year/date = 2005,
  puplisher = {Springer},
  location = {Berlin, Heidelberg}
}

@incollection{Crud96,
  author = (Cruden, David M. and Varnes, David J.},
  editor = {Turner, A. Keith},
  editora = {Schuster, Robert L.}
  title = {Landslide Types and Processes},  
  booktitle = {Landslides: investigation and mitigation},
  date = 1996,
  puplisher = {},
  location = {}
}
@article{Huer03,
  author = {Huerlimann, M. and Rickenmann, D. and Graf, C.},
  title = {Field and monitoring data of debris-flow events in the Swiss Alps},
  journaltitle = {Canadian Geotechnical Journal},
  volume = {40},
  number = {},
  date = 2003,
  pubstatedoi = {10.1139/T02-087},
  size = {Online-Ressource},
  pages = {161-175},
  url = {},
}