Harvard style is an author-date referencing system. There are many varieties of Harvard referencing system. This guide follows the standards described in the 'Style Manual for Authors, Editors and Printers' 6th edition, often referred to as the 'AGPS Manual' as it was formerly published by the Australian Government Publishing Services. It is also referred to as the 'Snooks manual', because the 6th edition was prepared by the consultants Snooks and Co. This guide is also compatible with the Harvard SCU style used in Endnote software.