Without doubt the most common referencing format mistakes relate to the increasing popular practice of obtaining source material via electronic means e.g. the Internet. Most Internet references will have been accessed via a specific web page, however, remember there are other Internet sources e.g. newsletters, online newspapers, ebooks etc.
APA style referencing guidelines suggest that an Internet source should provide a document title or description, a date (either the date of publication or update or the date of retrieval), an Internet address (URL) and whenever possible, the author(s) of the source material as well.