Original tool:

Deardorff, D.K. & Deardorff, D.L. (2000). Diversity awareness and training: Tools for cultural awareness. Presentation made at North Carolina State University. 

Also found in the following:

1. Deardorff, D.K. & Bowman, K.M. (2011). Beneath the tip of the iceberg: Improving English and understanding of U.S. cultural patterns. The University of Michigan Press. 
2. Berardo, K. & Deardorff, D.K. (2012). Building Intercultural Competence: Innovative Activities and Models. pp. 58-60. Stylus.