# ISBN field not showing with bibliography style “plain”

Why do the contents of the ISBN field not appear?

\bibliographystyle{plain}

e.g.

@ARTICLE{BS6399,
author={Committee   B/525/1},
year={1997},
publisher = {BSI},
ISBN     = {0 580 27447 0},
},

• Welcome to TeX.SX! Please help us help you and add a minimal working example (MWE) that illustrates your problem. Reproducing the problem and finding out what the issue is will be much easier when we see compilable code, starting with \documentclass{...} and ending with \end{document}. – DG' Sep 14 '17 at 7:47
• plain is an old style. It doesn't know ISBNs. It wouldn't know a field androidversion either. – Johannes_B Sep 14 '17 at 7:51
• try deplain.bst from comedy.dante.de/~herbert/Bibliography/german It knows the ISBN field – user2478 Sep 14 '17 at 8:15

There are two [2] reasons for why the isbn field isn't showing up:

• The plain bibliography style is more than 30 years old. (Yes, really!) As such, plain isn't programmed to recognize fields such as isbn, url, doi, eid, issn, and a few others that are recognized by, say, the plainnat bibliography style.

• Using the @article entry type is simply wrong for the entry at hand. Moreover, even with the plainnat bibliography style the @article entry type is not programmed to do anything with a field called isbn.

In plainnat, the @article entry type does do something with a field called issn (International Standard Serial Number) but not with isbn (International Standard Book Number).

I suggest you (a) use the plainnat bibliography style and (b) change the entry type to @book.

\RequirePackage{filecontents}
\begin{filecontents}{mybib.bib}
@book{BS6399,
author    = {Committee B/525/1},
note      = {BS 6399-2:1997},
year      = {1997},
publisher = {BSI},
ISBN      = {0 580 27447 0},
}
\end{filecontents}

\documentclass{article}
\usepackage[numbers]{natbib}
\bibliographystyle{plainnat}

\begin{document}
\cite{BS6399}
\bibliography{mybib}
\end{document}

• Optional: Change "BSI" to "British Standards Institute". At least some of your readers will appreciate not having to parse the acronym. – Mico Sep 14 '17 at 8:21