Ketidakpastian itu mahal
Artikel Jurnal
Benda mahal itu bernama buku
Artikel Jurnal
Soetjiningsih, author
Rumbuh kembang anak
EGC, 1987
Buku Teks
Boyle, D.G.
Language and thinking in human development/D.G. Boyle; Editor, George Westby
Hutchinson University Library , 1971
Buku Teks
Opec Fund Newsletter
Austria : The Opec Fund For International Development, 2006,
Majalah, Jurnal, Buletin
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