Citing an Annual Report from a company's website should follow the following format in APA Style:
Name of company. (Year published). Title of the annual report. Retrieved from URL of website.
Ex: Barnes & Noble. (2015). Barnes & Noble 2015 Annual Report. Retrieved from http://www.barnesandnobleinc.com/documents/bn_annual_report_2015.pdf
Microsoft Word 2010 - look under the 'references' tab at the top of the screen. Choose "APA" from the drop-down menu next to "style". Next, choose on "Insert Citation" and "Add New Source". Choose your format and then select "Show All Bibliography Fields" and enter required information for the resource you are using.
10-K in-text citation example:
Noted within the latest 10-K for the corporation (General Motor Corporation. 2008, February 28th):
"if U.S. vehicle sales do not meet our expectations, we may choose to reduce our production further . . .we anticipate that this will have a negative impact on our revenues and profits" (Item 1A. Risk Factors, Economy and Industry Conditions, paragraph 1).