Although you must reference anything you use which is not your own work in order to avoid being accused of plagiarism, you will find that many departments at Portsmouth do not allow you to use your lecture or course notes as sources for your essays. It is good academic practice to use the reading list and any slides or notes which your lecturer has given you, and turn to the sources listed in these when writing your essay. If your lecturer has not indicated where they got their information, and you want to use it, ask them for their source.
In a situation where lecture notes or slides contain specific information which is only available from a lecturer, via Moodle, or from someone who took notes during a lecture, you should treat this as a personal communication as the source will not necessarily be accessible to your reader or marker.
If your lecturer has included a copyright cleared scan of a journal article, book chapter or other source such as a report in their course materials, you won't be able to provide a working URL as part of your reference. You should therefore treat this source as if it was used in print format.
Follow the relevant guidance depending on the source type.
For example:
If it is a journal article, use the guidance here.
If it is a chapter from an edited book, use the guidance here.
If it is a report by an organisation, use the guidance here.