Website [from Electronic source using APA 6th ed.]
This format should only be used when referencing an entire website from the homepage onwards or if you are making a passing reference to a website in the text of your work. If you are referring to a specific webpage within a website then see guidance on how to reference a webpage
You do not need to include a whole website in your reference list. It is sufficient to cite the name of the website and the web address (URL) in your text. Include the web address (URL) in brackets where possible or revise the sentence to avoid ending a sentence with a URL and no punctuation.
Citation in Text
... there is a wealth of statistical information on the Office for National Statistics (ONS) website (http://www.ons.gov.uk).