Check out the new Bellack Library APA Formatting Guide for examples of the most used APA citations and things not covered in the official manual.
Here are even more resources to help you with your citations and writing.
Enroll in Bellack Library's short, self-paced online course on Academic Integrity that uses videos and written materials to help you learn to avoid plagiarism.
Here are a few additional guides that can help you avoid plagiarizing.
Quoting, Paraphrasing, and Summarizing (Purdue OWL)
Incorporating References (University of Kanas)
Avoiding Plagiarism (Purdue OWL)
Avoiding Plagiarism - Paraphrasing (MIT)
You may also want to talk with the MGH Institute's Writing Consultant.