Evaluating resources is much like having a conversation--you ask questions to learn more about the resource (author, main ideas, etc.) and to determine how it relates to your research (relevancy). This is also a time to determine if your source "knows" what it is talking about (accuracy, authority. etc.)
Remember: Annotations are original descriptions that you create after reading the document. When researching, you may find journal articles that provide a short summary at the beginning of the text. This article abstract is similar to a summary annotation. You may consult the abstract when creating your evaluative annotation, but never simply copy it as that would be considered plagiarism.
APA Citations Style Guide [Cornell]
MLA Formatting and Style Guide [Purdue]
Other Style Guides (MLA, APA, CSE, etc.)