If you are new to referencing in Economics take a look at the useful Economics Referencing Guide, which is part of the Economics subject Libguide. The Faculty of Economics recommends the Cite them right Harvard (Author-Date) referencing style, which is explained very clearly in the Economics Referencing Guide.
The Faculty do not mind if you use other referencing systems, as long as you are consistent. However, if you are new to referencing it can be really useful to start with this simple system. On the right hand side of the page you will see some clickable links, which show you exactly how to set out a reference for a particular type of resource
There is also a link to the Cite them right website, which has even more examples, videos and explanations about this Author-Date system.