Do not use footnotes to reference information. Associated Press style does not allow for bibliographies or works cited pages, or for citations via footnotes. An information report employing Associated Press style needs to communicate solid information to its readers and information must be clearly referenced within the article.
Use an in-text citation such as, "According to the Mayo Clinic's citation guidelines, writers must ask permission to reprint entire articles from the website." Attribute your information directly to its source in the body of your article.
Do not use footnotes to add anecdotes or extra information to your article. Associated Press style does not include footnotes in this case, either.
Use the same method of citation regardless of your source. Books and journal articles, for example, should both be cited in this method.