Bibliography details (volume, page numbers) not printed

Question

In all bibliography styles I found online, volume and page numbers are printed. However, whenever I try this does not happen, I only get authors, title, journal and year for articles, and only title, publisher and year in books.

I use bibtex:

\bibliographystyle{plain}
\bibliography{myreferences}

What am I doing wrong? I am probably overlooking something really basic.

EDIT: example bib-entry:

@Article{Pope00,
author = {Pope, R.J. and Millington, A.C.},
title = {Unravelling the patterns of alluvial fan development using mineral magnetic analysis: examples from the {S}parta basin, {L}akonia, southern {G}reece},
journal = {Earth surface processes and landforms},
year = {2000},
OPTvolume = {25},
OPTpages = {601-615},
}

Answer 1

A tradition that I believe was inaugurated by the BibTeX mode of Emacs, to which TeXStudio (formerly TeXMakerX) adheres, is that optional fields in a bibliographic entry are prefixed by OPT. So when you ask for a new @article entry, you get something like

@Article{,
  author = {},
  title = {},
  journal = {},
  year = {},
  OPTkey = {},
  OPTvolume = {},
  OPTnumber = {},
  OPTpages = {},
  OPTmonth = {},
  OPTnote = {},
  OPTannote = {}
}

(maybe with bullets to stand for the field contents). This is because some of the fields are optional and some are ignored by the standard styles, but are useful anyway. The only mandatory fields for an article are author, title, journal and year.

Since the rule of BibTeX is to ignore unknown fields, those prefixed with OPT will be ignored whether filled or empty. But if you fill them you have also to remove the OPT prefix. So, in your case, the entry should look like

@Article{Pope00,
  author = {Pope, R.J. and Millington, A.C.},
  title = {Unravelling the patterns of alluvial fan development using mineral magnetic
           analysis: examples from the {Sparta} basin, {Lakonia}, southern {Greece}},
  journal = {Earth surface processes and landforms},
  year = {2000},
  volume = {25},
  pages = {601-615},
}

Note also that, contrary to what's found in many guides, it's preferable to brace the entire word we want to maintain the capitalization of, so that kerning will be applied between all the letters.