Material on websites, although apparently "freely available", is subject to copyright restrictions too.
There is no specific guidance about how much of a website can legally be copied, so it is necessary to use judgement when applying fair dealing. Note that copyright in images may not belong to a website's owner - they should have asked permission to reproduce, and you must too.
See Cite them Right online (link below). The URL should be given in the acknowledgement of any material from websites, and also the date the webpage was accessed, as this provides an assurance that the website existed at a particular time, even if it has subsequently disappeared.
Online guide to referencing. It will help you to reference books, journals, articles, websites, and understand how to avoid plagiarism. It includes guidance and examples for a number of referencing styles, especially Harvard.
The 13th edition of Cite Them Right no longer requires place of publication to be included when referencing books or book chapters. Some programme handbooks still indicate that place of publication should be included. Until further notice, either option should be considered correct provided there is consistency across all references.