How this section works

Pages and exercises in modules may contain references to material that is outside the module. These references are grouped into a section know generically as 'related documents', although its title on the screen may not be the same as this.

References can be classified into types such as 'book references' or 'web references', and any of these may contain hypertext links which display linked content in a separate browser window.

Links within related documents sections can usually only be opened using the mouse. In non-interactive — that is, non-evaluated — pages, however, it will usually be possible to select the link using the TAB key and to open it using RETURN.