Bibliografi : hlm. 315 -316
No Inv.: 113484/P/Perp/08/1c
No Inv.: 110044/PSM/Perp/07/1c
No Inv.: 1182/S/91/1c~80422/S/02/1c
No Inv.: 121200/PH/Perp/09/1c
No Inv.: 109947/S/Perp/07/1c
No Inv.: 129318/SM/Perp/11/1c
Judul asli : "State of the World 1993"