This is looking at benefits to the U.S. It is also dated. But it has a pro-con segment, chronology, background, and can offer a picture from a point in history.
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Books
Look for sources representing a variety of perspectives so you can address the arguments involved.
Free Trade
Peloso, Jennifer. 2005 HF1713 .F735 2005
Consuming Mexican Labor: From the Bracero Program to NAFTA
E184.M5 M59 2011
NAFTA Revisited: Achievements and challenges
Hufbauer, Gary Clyde. 2005. HF1746 .H85 2005
Requiem or revival?: The Promise of North American integration
eBook 2007. Click on title, then link to access. U.S. mainstream views: "Within NAFTA, explores interactions between regionalism and multilateralism, the impact of the "new trade" agenda, and unresolved problems--migration, security, and energy. Discusses NAFTA’s relationship to the Free Trade Agreement of the Americas negotiations and the Doha Development Round and various ways in which NAFTA could be revamped or improved"
From the Farm to the Table: What All Americans Need to Know about Agriculture
Holthaus, Gary H. eBook. 2006. One chapter specifically on NAFTA, CAFTA, etc.
"The goal of the Cato Institute Center for Trade Policy Studies is to increase public understanding of the benefits of free trade and the costs of protectionism."
