Cohen, David
The development of play
Routledge, 2006
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Scandett, W. George
Childen's play
Sage publications, 2005
 Buku Teks
Children's play
by W. George Scarlett, Sophie Naudeau Dorothy Salonius-Pasternak and Iris Ponte
Sage, 2005
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Goode, William J.
The Family
Prentice-Hall, 1964
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Jeffree, Dorothy Moud, 1913-
Let me play
Souvenir Press, 1994
 Buku Teks SO