2Roth, K. J., Druker, S. L., et al. (2006). Teaching Science in Five Countries: Results from the TIMSS 1999 Video Study (NCES 2006-011). Washington Dc: National Center for Education Statistics.
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4http://nces.ed.gov/timss
5Roth, K. J., and Gamier, H. (2007). What Science Teaching Looks Like: Arrlntemational Perspective, Educational Leadership, 21-22.
