It’s best to start your research by using LSBU databases before searching the free web. Remember that anyone can publish anything on the web, so you will need to evaluate the quality and reliability of a web page or web document before you refer to it in your assignments.
If you cannot find a date on the webpage you can use the copyright date. If the copyright is written as a date range (e.g. 2007-2017) use the latest date.
For further guidance on referencing online sources, see General guidelines for referencing online resources
You will need:
Author’s surname, Initials. or Name of organisation (Year of publication, or year the page was last updated) Title of the webpage. Available from: www.webaddress.com [Accessed day month year].
Burke, L. (2018) Carbohydrates? They aren’t that simple. Available from: http://www.sportsci.org/news/compeat/carbo.html [Accessed 14 February 2019].
In-text citation: (Burke, 2018)