Other referencing software

Zotero
Zotero is a free plugin for Mozilla Firefox.
Quick start guide
More guides

Mendeley
is a web-based referencing programme, but also includes a social network for users. Mendeley is available free of charge.
Mendeley Video tutorials

BibTeX
BibTeX is used to create references and bibliographies in LaTeX. BibTeX and LaTeX can be downloaded free of charge.