Grey Literature refers to "reports, conference proceedings, preprints, working papers, theses, dissertations, personal communications, technical notes" and other ephemeral scientific sources, often published by government, business or academic organizations*. This kind of literature can be key for emerging research and alternative perspectives.
Government Publications are a subset of grey literature, and can be important sources for state, federal, and international perspectives on official government proceedings of all kinds. Find these by using an Advanced Google Scholar Search or the Australian Government Web Archive
Trade Literature refers to magasines, websites, newsletters and other sources aimed at professionals in a particular field. These sources will often report news and trends in the field, reviews of products related to the industry at hand, interviews with leaders in the field, as well as job listings and advertisements. Use QUT Library QuickFind or a library database & limit results to trade magazines. Examples are HRMagazine, Workforce, Strategic HR Review