[Tex/LaTex] Printed cited refs under “References” and then print all references under “Bibliography”

biblatex

I'm doing a dissertation which has the requirements of printing a References section, of those resources which have been cited, and then a bibliography which includes all resources, cited or not.

I've tried this:

\usepackage[backend=bibtex,citestyle=authortitle,url=true]{biblatex}
\usepackage{filecontents}
\bibliography{refs} <- and what does this do?
\addbibresource{project_references.bib}
\renewcommand{\bibname}{References}

\begin{document}
    \printbibliography

    \nocite{*}
    \printbibliography
\end{document}

But the \nocite{*} has an effect on both, regardless of where it is. Which defeats the point. I've been through numerous answers which include creating a boolean of "cited" and then trying to print those but nothing seems to work!!

I just want:

"References"
Yada yada… I've been cited!

"Bibliography"
Yada yada… I may not have been cited!

Taking the answer received this is what I have now, which is not working. All references are being printed in each section:

\documentclass[12pt]{report} 
\usepackage[backend=bibtex,citestyle=authortitle,url=true]{biblatex}
\usepackage{filecontents}
\addbibresource{project_references.bib} 

\begin{refsection}
\chapter{Introduction}
\subfile{Introduction.tex}

\chapter{Literature Review}
\subfile{LiteratureReview.tex}

\chapter{Design}
\subfile{Design.tex}

\chapter{Implementation and Testing}
\subfile{Implementation.tex}

\chapter{Evaluation}
\subfile{Evaluation.tex}

\chapter{Conclusion}
\subfile{Conclusion.tex}

\printbibliography[title=Cited]
\end{refsection}

\printbibliography[title=References]

\nocite{*}
\printbibliography[title=Bibliography]
\end{document}

Don't know if it matters but I'm not using article, because I want chapters.

Best Answer

You can use something like

\documentclass{article}
\usepackage[style=authoryear]{biblatex}
\addbibresource{onlysome.bib}

\begin{document}
\begin{refsection}
  \section{Foo}
  \cite{one}

  \section{Bar}
  \cite{two}

  \printbibliography[title=Cited]
\end{refsection}


\nocite{*}
\printbibliography[title=All]

\end{document}

The first \printbibliography will only print the items inside that refsection, that is those that are cited.

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