Strommen, E. A. (1983). Development psychology: The school-aged child. The Dorsey Press.
Lua i Stíl Chicago (17ú heag.)Strommen, Ellen A. Development Psychology: The School-aged Child. The Dorsey Press, 1983.
Lua MLA (9ú heag.)Strommen, Ellen A. Development Psychology: The School-aged Child. The Dorsey Press, 1983.
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