• Bibliography: Does the author cite relevant expert sources?
• Notes: Does the author provide strong evidence for his claims?

Digging deeper:

• Is more than one viewpoint fully represented and fairly considered?
• Do the author's conclusions follow logically from the analysis?
• Does this add a different point of view?
• Does this make sense, given what I already know?
• What do others say about this book?

Corroborate: Compare information from different media (e.g., magazines, reports, newspapers, blogs) to gather diverse viewpoints.