Frost, J. L., Wortham, S. C., & Reifel, R. S. (2005). Play and child development (2nd edition.). Pearson/Merrill/Prentice Hall.
Čikaški stil citiranja (17. izdanje)Frost, Joe L., Sue Clark Wortham, i Robert Stuart Reifel. Play and Child Development. 2nd edition. Upper Saddle River, N.J: Pearson/Merrill/Prentice Hall, 2005.
MLA način citiranja (9. izdanje)Frost, Joe L., et al. Play and Child Development. 2nd edition. Pearson/Merrill/Prentice Hall, 2005.
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