The document provides an overview of the Harvard referencing system for citing sources in academic writing. It explains that referencing involves acknowledging authors when quoting or using their ideas to avoid plagiarism. There are two types of references - in-text citations and a bibliography. In-text citations provide brief details of the source in parentheses, while the bibliography lists full details of all cited sources alphabetically at the end of the paper. The document gives examples of formatting references for different source types like books, journals, and websites.