Remove italics style in bibliography, use only upright font shape

Question

I have a question on the font style of the bibliography.

My references use italics for book titles. Is there any command I can set to make sure all text in the bibliography is in one style only, i.e., the upright style?

Answer 1

What should work for any bibliography style using either \em (e.g., plain) or \emph (e.g., plainnat) or the more basic \itshape is to put the bibliography inside a group and to issue \let\itshape\upshape at the start of this group.

\documentclass{article}

\usepackage{filecontents}

\begin{filecontents}{\jobname.bib}
@book{A01,
  author = {Author, A.},
  year = {2001},
  title = {Alpha},
}
\end{filecontents}

\begin{document}

\nocite{*}

\begingroup
\let\itshape\upshape

\bibliographystyle{plain}
\bibliography{\jobname}

\endgroup

\end{document}