A summary is a shortened version of an original text. It includes the thesis and major supporting points of the original, and should reveal the relationship between the major points and the thesis. It may be any length, from 25% of the original to one sentence. Make sure you know what length your teacher expects.
For this assignment, as long as you are only referring to the article you're summarizing, you do not need to create any citations.
However, if you decide you need to incorporate additional sources for your presentation, you will need to cite those sources using APA style.