An annotated bibliography is more than a list of sources you are using in your research paper. Before you begin, watch this video for details.
Your instructor has asked you to find 2 acceptable sources for your topic. Look for elements of credibility and authority in the sources you choose, such as the reputation of the author, where they work (now and in the past), what and where they've published. Also note the date of publication: Consider whether you can find updated information elsewhere.
Use lateral thinking to find others who may have cited these individuals or their work in the past. This will indicate their knowledge about a subject and how well it's been accepted as fact or valid analysis by others.
Be careful to avoid editorials or opinion pieces. If you want to use these, consider a balanced approach by finding the other side of an argument. You can avoid bias by reviewing where the source material sits in the AllSides Media Bias Chart.