Van Hoorn, J. L., Nourot, P. M., Scales, B., & Alward, K. R. (2003). Play at the center of curriculum (Third edition.). Merrill/Prentice Hall.
Čikaški stil citiranja (17. izdanje)Van Hoorn, Judith Lieberman, Patricia Monighan Nourot, Barbara Scales, i Keith Rodriguez Alward. Play at the Center of Curriculum. Third edition. Upper Saddle River, New Jersey: Merrill/Prentice Hall, 2003.
MLA način citiranja (9. izdanje)Van Hoorn, Judith Lieberman, et al. Play at the Center of Curriculum. Third edition. Merrill/Prentice Hall, 2003.
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