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
Judul asli : "Neiburge, Understanding our Environment".
No Inv.: 3366-3370/P/Perp/95/5c~7561-7570/P/Perp/97/10c~103345/S/Perp/05/1c
Perpustakaan memiliki jilid 1 dan 2
No Inv.: 5142-5146/P/Perp/92/5c~2170-2171/Perp/85/2c~1724-1725/Perp/85/2c~2093-2095/Perp/87/3c~217/S/Perp/88/1c
Judul asli : "Effective Speaking"
No Inv.: 4343-4345/P/Perp/95/3c~3393-3413/P/Perp/99/20c
No Inv.: 2326-2330/P/Perp/95/5c
No Inv.: 86437-86438/S/Perp/05/2c~135416/SM/Perp/13/1c
No Inv.: 104145-104149/P/Perp/06/5c