You need 3 sources. One must be a peer reviewed article.

• EBSCO -- Scholarly and peer-reviewed journals. Also contains magazines so be sure to click in "peer-reviewed" box.
• CQ Researcher -- objective reports on social, political, cultural topics
• Opposing Viewpoints -- opinionated articles arguing a viewpoint
• List of all library databases

Scholarly peer-reviewed articles undergo a rigorous review process by a committee of experts in the field before they can be published. Traits include:

• Authors have advanced degrees (PhD or Master's)
• Usually no color or advertising
• Technical jargon, written at an advanced level
• Lengthy articles
• Always a list of references
• Charts and graphs
• Purpose is to further knowledge in the field (new studies, new theories)
• Audience is other scholars