1Maryellen, H., Teresa, A. S., Michael, O. M. Performance Assessment in IEA's Third International Mathematics and Science Study (TIMSS), 1997 : A-2.
2Mullis, V. S., Michael, O. M., Graham, J.R. TIMSS 2007 Assessment Frameworks. i., 2005.
3Steve Schneider, Alice Fu. 2009 NAEP Science Framework and Specifications (CAESL "Brown Bag" Seminar), 2006:6-7.
4Mullis, V. S., Michael, O. M., Graham, J.R. TIMSS 2007 Assessment Frameworks, 2005 : 102-104.
5West E.D.,CC- SSO. Science Assessment and Item Speeifieations for the 2009 National Assessment of Educational Progress (Prepublieation Edition), 2007 : 158-268.
6Michael, O.M. TIMSS 2003 User Guide for the International Database, 2005 : 25-26.