Hughes, F. P. (1999). Children, play, and development (Third edition.). Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Hughes, Fergus P. Children, Play, and Development. Third edition. Boston: Allyn and Bacon, 1999.
Lua MLA (8ú heag.)Hughes, Fergus P. Children, Play, and Development. Third edition. Allyn and Bacon, 1999.
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