Include: Author's surname, Author's initial(s)., or Website owner (may be a company or organisation), Date (if known, otherwise add n.d. for no date). Web site address [Accessed Date--the date information was researched].
Examples
Anglia Ruskin University, 2018. http://libweb.anglia.ac.uk/referencing/harvard.htm [Accessed 11 February 2019].
World Wildlife Fund, 2010. https://www.worldwildlife.org/ [Accessed 20 February 2019].