APA (a Harvard type style)
In APA style there will be an author and date in your text like this: (Casey, 1985) and an alphabetical list of references at the end like this:
Casey, F. (1985). How to study: A practical guide. Macmillan.
Clare, J. (1988). Revision, study and exam techniques guide. First and Best.
Fairbairn, G., & Fairbairn, S. (2001). Reading at university: A guide for students. Open University Press.
Johnson, R. (1995). Improving your writing skills. Clifton Press.
Vancouver (a numeric style)
In Vancouver style there will be a number in brackets in your text  and a list of references at the end in the order they appear in the text, like this:
1. Casey F. How to study: a practical guide. Basingstoke Macmillan; 1985.
2. Clare J. Revision, study and exam techniques guide. Corby: First and Best; 1998.
3. Fairbairn G, Fairbairn S. Reading at university: a guide for students. Buckingham: Open University Press: 2001.
4. Johnson R. Improve your writing skills. Manchester: Clifton Press; 1995.
Mendeley allows you to collect, manage, share and use references you find in the course of your research. It can be used with Word to add citations and produce a reference list within a document. Mendeley has a web-based element that can be used with any Internet browser; however you need to use the desktop element to use the Citation PlugIn with Word. Mendeley is freely available. Mendeley will:
To find out more see the Mendeley libguide.
Zotero is a free open-source browser plugin.
Zotero library guide (an excellent tutorial by Jason Puckett: Georgia State University Library).