Judul asli : "Identifying and Solving Problems : a System Approach"
No Inv.: 4896/P/Perp/99/1c
No Inv.: 6256/P/Perp/99/1c
No Inv.: 68/P/Perp/99/1c
No Inv.: 79/P/Perp/99/1c
No Inv.: 3059-3060/P/Perp/99/2c~135819/PH/Perp/13/1c
No Inv.: 3499/P/99/1c
No Inv.: 3808/P/99/1c
No Inv.: 5160-5164/P/99/5c
No Inv.: 75955-75959/01/P/5c~114862/PH/Perp/08/1c~121162/S/Perp/09/1c~130119/SM/Perp/11/1c~136530/SM/Perp/13/1c