No Inv.: 11109/P/Perp/98/1c
No Inv.: 11128/P/Perp/98/1c
No Inv.: 394/P/Perp/98/1c
No Inv.: 10745/P/Perp/98/1c
No Inv.: 11934/P/Perp/98/1c
No Inv.: 710/P/Perp/98/1c
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