Often, these requirements ("Only use scholarly articles," "Don't use Google," "You must have 1 print book") seem arbitrary to students. Absent context, these requirements can cause students undue stress and anxiety--especially if they have trouble identifying source types in the first place.
Annotated bibliographies are great for scaffolding research projects. They help students practice source evaluation and summary.
This can help students get a sense of what kinds of information (what types of sources, what perspectives) exist for a topic.
Scaffold the process of choosing and using sources by having students initially gather more resources than they're required to cite in the final version of their project. Then have them choose the sources they'll actually use from this larger list.
Students often appreciate more creative format options for research projects. If you're sick of grading research papers, imagine how sick your students are of writing them... Try: