What is the source of a website?
Do you mean source code? If so, the source code is the actual code a person or program writes up to makes a webpage/site display and function in the desired fashion. It can often be found by right clicking on a webpage and selecting "View Source code"
Online When citing a website in APA include the following information: The name of the website(in italics) The name of the website article Author of the source The date the website was created or when the particular online source was published (if known) Date the website was accessed The website URL