Section 10.16 of the APA manual provides information on creating references for webpages and websites (pp. 350-352).
If you are referring to an entire website, you do not need to create an in-text citation or a reference list entry. Instead, note the name of the website in the text and include the site's URL in parentheses.
If you are citing webpages from a website, create references for each page.
Example of a webpage with a group author:
Canadian Nurses Association. (2009). Canadian organizations come together in the fight against malaria. http://www.cna-aiic.ca/CNA/news/releases/public_release_e.aspx?id=248
*Note that the second and subsequent lines should be indented in APA references (not shown in the examples above due to html formatting.)
First citation in text: (Canadian Nurses Association [CNA], 2009)