The words and ideas that you read as you prepare to write an essay or other written assignment are the intellectual property of the person/s who wrote them, and these must be referenced. Failure to do so is plagiarism, which is penalised by examiners. You must also reference all images, tables, and graphs taken from printed or internet sources.
Centre for Academic Writing (CAW) has developed a series of academic writing resources, including The Coventry University Guide to Referencing in Harvard Style (PDF), which can be also accessed via LibGuide. This is a simple system which is used internationally by scholars and researchers. The lecturing team at the CAW have customised the various versions of this referencing style into one user-friendly guide for use by students and staff at Coventry. The guide also contains a glossary of key terms used in referencing.