Association for Supervision and Curriculum Development & Marsh, D. D. (1999). Preparing our schools for the 21st century. Association for Supervision and Curriculum Development.

Association for Supervision and Curriculum Development and David D. Marsh. Preparing Our Schools for the 21st Century. Alexandria, Va.: Association for Supervision and Curriculum Development, 1999.

Association for Supervision and Curriculum Development and David D. Marsh. Preparing Our Schools for the 21st Century. Association for Supervision and Curriculum Development, 1999.