The following examples show how to produce Harvard style references using biblatex.
See this post on TeX StackExchange for further discussion on the Harvard referencing style, and this post for more details on switching to biblatex if you're more familiar with e.g. natbib.

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LaTeX is great for plotting mathematical shapes -- here we present an example of a cardioid.
A cardioid is a plane curve created by tracing a point on the perimeter of a circle rolling around a fixed circle of the same radius. Read more
Original source: http://www.altermundus.fr/pages/euclide.html

PSTricks provides a number of built in functions to enable the quick creation of figures, graphs and diagrams in LaTeX. Here we see how to use the built in command for drawing a circle.
Original source: http://www.thelazymathematician.com/p/pstricks-examples.html

The pstricks package can be used to quickly draw polygons and other shapes in LaTeX, as an alternative to the TikZ package. This short example shows how to use pstricks to draw a polygon with some simple styling.
Original source: http://www.thelazymathematician.com/p/pstricks-examples.html

Following on from example 4 which showed how to plot the graph of a function in LaTeX using pstricks, here we extend the example to show how trig functions such as cos, sin and tan can be plotted.
Original source: http://www.thelazymathematician.com/p/pstricks-examples.html

A short example to show how to use pstricks to plot the graph of a function in LaTeX.
Original source: http://www.thelazymathematician.com/p/pstricks-examples.html

A quick example to demonstrate how pstricks can be used to show a curve between points, and to show the grid axes view.
Original source: http://www.thelazymathematician.com/p/pstricks-examples.html

This example shows how to use the pstricks package to indicate an interval region.
Original source: http://www.thelazymathematician.com/p/pstricks-examples.html