Here are links to the three readings for Session 4, "Critical and Creative Thinking":

Teaching Thinking Skills  by Kathleen Cotton

Creative and Critical Thinking in Language Classrooms by Muhammad Kamarul Kabilan

Learning through Discussion: Designing Tasks for Critical Inquiry and Reflective Learning by Karen Ngeow and Yoon-San Kong

If you are particularly interested in the "Critical Thinking" topic, I strongly suggest you also look through these:

Higher Order Thinking Skills Question Templates 

Learning Domains or Bloom's Taxonomy  by Donal Clark

Role Playing Games and Activities Rules and Tips from businessball.com

Six Thinking Hats based on Edward de Bono's work