Cite Them Right is highly recommended for students who are new to referencing. There is an excellent chapter on Harvard (Section G).
It's available in the library at Shelf Number 808.027 PEA
A Student-Friendly Guide to Referencing: Harvard edition
Citing and referencing the information sources used in student assignments and research is essential to avoid plagiarism.
The OWL (Online Writing Lab) is a good place to start if you need advice or help with paraphrasing, avoiding plagiarism or getting started with a particular citation style.
Abbreviated journal titles may be required depending on the citation style used. Some useful tools which 'translate' the full journal title into the abbreviated version are:
Tip: Check with your School or supervisor as there may be an in-house style requirement for your assignment such as the European Journal of Clinical Nutrition Style, the Harvard Style (author date) or the Numeric Citation Style.
If you're new to the Harvard referencing style use these getting started videos:
European Journal of Clinical Nutrition
Reference Managers