References
- Bloom, B. S., ed., M. D. Engelhart, E. J. Furst, W. H. Hill, and D. R. Krathwohl. 1956. Taxonomy of educational objectives: The classification of educational goals. Handbook 1: Cognitive Domain. New York: David McKay.
- National Standards in Foreign Language Education Project. 1999. Standards for Foreign Language Learning in the 21st Century. Lawrence, KS: Allen Press.