Cita APA (7th ed.)

Frost, J. L., Wortham, S. C., & Reifel, R. S. (2001). Play and child development. Merrill, Prentice Hall.

Cita Chicago (17th ed.)

Frost, Joe L., Sue Clark Wortham, i Robert Stuart Reifel. Play and Child Development. Upper Saddle River, N.J: Merrill, Prentice Hall, 2001.

Cita MLA (9th ed.)

Frost, Joe L., et al. Play and Child Development. Merrill, Prentice Hall, 2001.