Remember that you usually cite twice.
The Purdue Online Writing Lab (OWL) is another resource that contains more examples and instructions. Take a look at this resource for extensive examples on how to cite your sources and in-text citations.
Purdue OWL: APA Formatting - The Basics
Purdue OWL: In-text citations
Purdue OWL: APA Formatting: Reference List Basics
Take full advantage of online tools to generate citations, but ALWAYS refer back to the APA style guide to check for errors.
Bad data in = Bad data out. Double check to make sure authors look like authors, titles are in the right place, etc.
When you are within GALILEO, you can get a citation by e-mailing an article and using the Cite feature. Both of these options appear when you click an article title in your search results.
Plenty of other options exist.
Citation Generator is fairly quick and easy to use.
Zotero and Mendeley allow you to organize your research, citations, and generate bibliographies. A little upfront effort is involved, but if you are a super organizer, try them out.