Van Hoorn, J. L. (1993). Play at the center of the curriculum. Merrill.
Chicagoスタイル(17版)引用形式Van Hoorn, Judith Lieberman. Play at the Center of the Curriculum. New York: Merrill, 1993.
MLA(9版)引用形式Van Hoorn, Judith Lieberman. Play at the Center of the Curriculum. Merrill, 1993.
警告: この引用は必ずしも正確ではありません.