↑ Bloom, B. S.; Engelhart, M. D.; Furst, E. J.; Hill, W. H.; Krathwohl, D. R. (1956). Taxonomy of educational objectives: The classification of educational goals. Handbook I: Cognitive domain. New York: David McKay Company.
↑ Shane, Harold G. (1981). "Significant writings that have influenced the curriculum: 1906-1981". Phi Delta Kappan. 62 (5): 311–314.
