Our text used to help prepare students is: Argumentation & Debate Book by Christy L. Shipe ($13 / $11 for HSLDA members).

Other useful books for speech and debate are:

• Argumentation & Debate: Taking The Next Step by Deborah Bush Haffey, Jeffrey B. Motter, and Christy L. Shipe ($35 / $30 for HSLDA members)
• As I Was Saying by Thane Rehn ($22 from CFC)
• Coaching Policy Debate by Terry, Deanna, and Ryan Stollar ($35 from CFC)
• From Playpen to Podium by Jeff Myers ($11 from Christianbook.com)
• The Great Debate by Jonathan Wolfson ($25 from CFC)
• It Takes a Parent ... A Teaching Guide for the First Time Parent / Coach by Deanna Stollar ($35 from CFC)