Citation appears as question mark, bibliography has title but is blank

Question

I'm using the harvard package with BibTeX and not sure why it's coming up with question mark in pdf. Due to citation not working, reference is blank. Seen many people saying run BibTeX then LaTeX twice but this doesn't work at all. bib file should be fine as it's come straight from a journal site. My code is probably wrong..here's what I've got:

\documentclass{article}
\usepackage{mathtools}
\usepackage[top=3cm, bottom=3cm, left=4cm, right=2cm]{geometry}
\usepackage{bibentry}
\usepackage{bibtexlogo}
\usepackage{harvard}
\bibliographystyle{dcu}
\usepackage{cite}

\begin{document}

mortar’s properties.\cite{2003427682262} make reference...
etc. etc.

\bibliographystyle{dcu}
\bibliography{lanas}


\end{document}

Answer 1

Here are a few things to try:

• Run (pdf)LaTeX, then BibTeX, then pdfLaTeX twice.
• What happens if you run natbib instead of Harvard?
• Paste the citation key, don't retype (though probably not an issue in your case - you probably do anyway if that's the real key.
• I'm sure you've already check file name, folder etc. - do it again anyway!