Plant, J. S. (1950). The envelope: A study of the impact of the world upon the child. Commonwealth Fund.
Lua i Stíl Chicago (17ú heag.)Plant, James Stuart. The Envelope: A Study of the Impact of the World upon the Child. New York: Commonwealth Fund, 1950.
Lua MLA (9ú heag.)Plant, James Stuart. The Envelope: A Study of the Impact of the World upon the Child. Commonwealth Fund, 1950.
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