The National Institute for Health and Care Excellence (NICE, 2017) states that...
...(National Institute for Health and Care Excellence (NICE), 2017).
NICE (2017) states that...
Note: A good tip if you are going to use the same citation a few times in your assignment is to use acronyms. You must explain the acronym in full the first time you use it, followed by the acronym so it is clear to your lecturer what is stands for.
Author. (Year). Title. Retrieved from URL
Author. (Year). Title. Retrieved Month day, year, from URL
American Psychological Association. (2015). APA style blog. Retrieved May 3, 2018, from http://blog.apastyle.org/
National Institute for Health and Care Excellence. (2017). Type 2 diabetes in adults: Management. Retrieved
Note: Only include the date the information was retrieved if the website is likely to change frequently. The author of a website is usually a corporate author. However if you are citing a specific document on a website there may be personal authors.