Gaya APA
the secret of happy children. (2004).
Jakarta:
PT Gramedia Pustaka Utama.
Gaya Chicago
the secret of happy children.
.
Jakarta:
PT Gramedia Pustaka Utama,
2004.
Buku.
Gaya MLA
the secret of happy children.
.
Jakarta:
PT Gramedia Pustaka Utama,
2004.
Buku.
Gaya Turabian
the secret of happy children.
Jakarta:
PT Gramedia Pustaka Utama,
2004.
Buku.