Writing a presentation or report usually requires information from many sources (for example, market research reports, newspaper articles).
To maintain your professional and academic reputation, you must cite every source.
In the academic setting, we use formalized styles of attribution. Formatting your citations in a format like APA is just a standardized means of giving credit to the person or company who created the content you use. The content creator may be an author, blogger, photographer, or your professor, for example. Outside of academia, you'll probably cite your work in different ways. For a list of great examples, see Corey Eridon's blog post .
Some style manuals require that a "retrieved" date be included. APA does not, except in cases where the content may change over time. Company website citations should include the date that the cited content was accessed.
In this case, treat the organization as the author. We can be fairly certain that any content (aside from reviews or blog comments) was written on behalf of the company. We would not consider the author to be "Anonymous," even though no individual author is named.
If the content is not dated, use "n.d." in the place where you would normally put the publication date.