Bibliografi : hlm. 81
No Inv.: 270/S/Perp/90/1c~091/S/Perp/92/1c~2004-2013/P/Perp/96/10c
No Inv.: 13415/P/Perp/94/1c
Judul asli : "Improving Children`s Learnings Ability"
No Inv.: 271/Perp/89/1c
Judul asli :"Double your Brain Power"
No Inv.: 100330-100332/P/Perp/05/3c
No Inv.: 106391-106395/P/Perp/06/5c