There are many different reference generators out there that claim to create the reference for you. But beware, none of them are perfect and you will still need to tweak the result to match the correct format. To start with there are several different versions of Harvard. After you have grabbed the Harvard option from a reference generator you will need to edit it in your reference list so it matches the version of Harvard found in Cite them Right. Have our Quick guide to hand to help you check.
OneSearch will generate a reference for you but you will still need to check it. Take a look at this example of Reference creation in OneSearch.
Another tool that is available to you is RefWorks.
Refworks is an online reference management software that is provided by the University. It helps you to collect and store your references and to create your reference list in the correct format. As with other generators you need to have a good grasp of your referencing style to use it effectively. Download the RefWorks guide to get started.