[Tex/LaTex] Separating academic and non-academic references: Illegal, another \bibdata command

bibtexsubdividing

I am trying to use a separate bib file for two kinds of references: academic (articles, journals, etc) and non-academic (websites, blogs, etc).

To separate them, I create a file Academic.bib:

@article{academic,
  journal = "Journal",
  title = "Title",
  author = "Author",
  year = "2014"
}

And another file Non-academic.bib:

@article{nonacademic,
  journal = "Journal",
  title = "Title",
  author = "Author",
  year = "2014"
}

However, if I try to reference them in my document, bibtex gives me the error 

"Illegal, another \bibdata command".

Here's a minimal example:

\documentclass[a4paper,12pt,abstracton,titlepage]{scrartcl}
\usepackage{scrpage2}
\usepackage[utf8]{inputenc}

\title{Test document}
\author{Me}

\begin{document}
\maketitle
\newpage
\tableofcontents
\clearpage

\cite{academic} \cite{nonacademic}

\appendix

\section{Bibliography}
  \label{sec:bibliography}

  \bibliographystyle{plain}

  \subsection{Academic}
  \bibliography{Academic}{}
  \bibliography{Academic,Non-academic}{}

  \subsection{Non-Academic}
  \bibliography{Non-academic}{}

\end{document}

How can I achieve the intended result?

Best Answer

Bibtex solution:

Multiple bibliographies are not possible with standard bibtex. However, the multibib package allows for it.

multibib offers the \newcites{ac}{Academic} commands that appends the proxies ac to standard bibliography commands, i.e., \citeac, \nociteac, \bibliographystyleac and \bibliographyac. The second argument is the heading of the bibliography. In this case a second \newcites is required, i.e., \newcites{nac}{Non-academic}

After running latex, one has to run bibtex for each \newcites; in this cases:

bibtex ac
bibtex nac

and then latex two more times.

Here is a complete MWE:

\documentclass[a4paper,12pt,abstracton,titlepage]{scrartcl}
\usepackage{scrpage2}
\usepackage{multibib}
\usepackage[utf8]{inputenc}

\newcites{ac}{Academic}
\newcites{nac}{Non-Academic}

\title{Test document}
\author{Me}

\begin{document}
\maketitle
\newpage
\tableofcontents
\clearpage
\

\citeac{academic} \citenac{nonacademic}

\appendix


\section{Bibliography}
  \label{sec:bibliography}


\bibliographystyleac{plain}
  \bibliographyac{Academic}{}

\bibliographystylenac{plain}
  \bibliographynac{Non-academic}{}

\end{document}

producing:

enter image description here

Biblatex Solution

biblatex allows for multiple bibliographies. In this case one can define a special category non for non academic bibliographic entries, and then use the category and notcategory options of \printbibliography

\documentclass[a4paper,12pt,abstracton,titlepage]{scrartcl}
\usepackage{scrpage2}
\usepackage{biblatex}

\addbibresource{Academic.bib}
\addbibresource{Non-academic.bib}

\DeclareBibliographyCategory{non}
\addtocategory{non}{nonacademic}

\usepackage[utf8]{inputenc}


\title{Test document}
\author{Me}

\begin{document}
\maketitle
\newpage
\tableofcontents
\clearpage
\

\cite{academic} \cite{nonacademic}

\appendix


\section{Bibliography}
  \label{sec:bibliography}

\printbibliography[title=Academic,heading=subbibliography,notcategory=non]

\printbibliography[title={Non-Academic},heading=subbibliography,category=non]


\end{document}

enter image description here

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