A report differs from a web page because it is an official document that is often in the form of a lengthy PDF. The word report is usually in the title, and sometimes there is a document number associated with it. Here is an example of a report that can be found on the CDC website:
Centers for Disease Control and Prevention. (2009). Fourth national report on human exposure to environmental chemicals. Retrieved from http://www.cdc.gov/exposurereport/pdf/FourthReport.pdf
Because this is a report, the title is italicized, and because it is a PDF, there is no need for a retrieval date. You might also find reports that are authored by individuals instead of organizations. In these cases, identify the publisher as part of the retrieval information. Here is an example:
Smith, J. (2010). How to include publisher in individually authored reports (Report No. 2456). Retrieved from the Centers for Disease Control and Prevention website: http://www.cdc.gov/madeupURL.pdf
For more information on using reports in your scholarly papers, see APA 6th edition section 7.03.