Creating proper APA citations can be challenging. Two sources that can help make it easier are Google Scholar and Son of Citation Machine. Pop your citation into Google Scholar, then . . . to grab a citation click on the Cite link below a search result and select from the available citation styles. Always double check to make sure formatting is correct by running your citation through another great source called Son of Citation Machine.
Son of Citation Machine
Other links to assist with citing APA style are below, these include video and textual tutorials.