Psikologi Anak = The pshycology of the child / Jean Piaget , Barbel Inhelder ; penyunting Eka Adi Nugraha ; Penerjemah Tifatul Jannah

Psikologi Anak = The pshycology of the child / Jean Piaget , Barbel Inhelder ; penyunting Eka Adi Nugraha ; Penerjemah Tifatul Jannah Piaget, Jean Eka Adi Nugraha Tifatul Jannah text Yogyakarta Pustaka Pelajar 2010 ind hlm. 185 - 188 Psikologi Anak URN:ISBN:978 - 602 - 8479 - 89 - 8