Benda mahal itu bernama buku
 Artikel Jurnal
Boyle, D.G.
Language and thinking in human development/D.G. Boyle; Editor, George Westby
Hutchinson University Library , 1971
 Buku Teks
Soetjiningsih
Rumbuh kembang anak
EGC, 1987
 Buku Teks
Opec Fund Newsletter
Austria : The Opec Fund For International Development, 2006,
 Majalah, Jurnal, Buletin
Nasution, Muhammad Yasir
Manusia menurut Al-Ghazali/Muhammad Yasir Nasution
Jakarta RajaGrafindo Perkasa 1999,
 Buku Teks