##

5.2.1 Author-Year Citations

The default behaviour of citations with bibliography styles such as
`plain` is to produce a numerical reference in square brackets.
If you're using `bibtex` (rather than `biblatex`,
described below) you
can override this using a number of packages. One such package is
`natbib`. This comes with some drop-in replacements for the
standard bibliography styles: `plainnat`, `unsrtnat`
and `abbrvnat`. The `natbib` package comes with a variety of
package options, but I'm just going to mention a few of them:
`authoryear` for author-year citations (default),
`numbers` for numerical citations,
`super` for superscripted numerical citations,
`round` for round parentheses,
`square` for square parentheses
and `sort&compress` which sorts multiple citations
and compresses consecutive numbers into a range. For example,
[4,2,8,3] will become [2-4,8].

So for citations that give the author and year rather than a number,
you need to load `natbib` in the preamble:

`\usepackage`

`[round]{natbib}`

and specify one of the `natbib` bibliography styles:

There are two main replacements for `\cite`

:

for textual citations and

for parenthetical citations.

Unlike `\cite`

, these commands have two optional arguments. The
second *<post>* is a suffix, the same as `\cite`

's only optional
argument. The first optional argument *<pre>* is a prefix. If
only one optional argument is present, it is assumed to be
*<post>*, so if you only want a prefix and no suffix, you have to
specify an empty argument for *<post>*.

**Example:**

(Using the same `thesis-ref.bib`
database as earlier.)

A textual citation `\citet`

`{turabian96}`
and a parenthetical citation `\citep`

`[see][Chapter
9]{goossens97}`.

Result:

This book is also available as A4 PDF or 12.8cm x 9.6cm PDF or paperback (ISBN 978-1-909440-02-9).