The State of the worlds children 1987
UNICEF
UNICEF, 1988
 Buku Teks
Pelligrini, Anthony D., author
Observing children in their Natural worlds : a methodological primer
Lawrence Elbaum Associates, 1996
 Buku Teks
Grant, P. James
The state of the world's children 1986
Oxford University Press, 1986
 Buku Teks
Russell, Richard Joel, author
Culture worlds
Macmillan, 1954, 1951
 Buku Teks
Russell, Richard Joel, author
Culture worlds
Macmillan, 1958
 Buku Teks
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