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}