No Inv.: 3952/Pb/Perp/86/1c
No Inv.: 1240-1243/Perp/85/4c
No Inv.: 100612-100613/P/Perp/05/2c
No Inv.: 1473-1474/Perp/81/2c
No Inv.: 3659/Perp/86/1c
Bibliografi : hlm. 252-262
Judul asli : The 5 elements of effective thinking
No Inv.: 134708/SM/Perp/13/1c