No Inv.: 1403-1405/S/Perp/92/3c
No Inv.: 2258/P/Perp/95/1c
No Inv.: 890/S/Perp/87/1c~1885-1886/S/Perp/91/2c
No Inv.: 672/P/Perp/95/1c
No Inv.: 3920/Perp/86/1c
No Inv.: 441/P/Perp/97/1c
No Inv.: 4619-4627/P/Perp/97/9c
No Inv.: 7161-7170/P/Perp/97/10c~88585-88586/P/Perp/2c~89566-89567/PSM/Perp/04/2c~102438/PSM/Perp/05/1c~107279-107280/S/PH/Perp/2c~111111-111115/P/Perp/07/5c
Judul asli : "Identifying and Solving Problems : a System Approach"
No Inv.: 3422/P/99/1c