No Inv.: 541/S/Perp/96/1c
No Inv.: 1578/S/Perp/94/1c
No Inv.: 124/S/Perp/96/1c~8049-4052/P/Perp/97/4c
No Inv.: 2926/P/Perp/96/1c
No Inv.: 547/S/Perp/95/1c
Bibliografi: hlm. 235-236No Inv.: 907/S/Perp/96/1c~5072-5081/P/Perp/97/10c~374-378/P/Perp/99/5c~115138/S/Perp/08/1c
No Inv.: 1133-1137/S/Perp/96/5c
Judul asli : "Neiburge, Understanding our Environment".
No Inv.: 252-261/P/Perp/96/10c
No Inv.: 2026-2030/Perp/79/5c