No Inv.: 997/P/Perp/99/1c
No Inv.: 1401-1405/P/Perp/98/5c~869-873/P/99/5c~77448-77450
Judul asli : "The Language of Trade"
No Inv.: 783-784/S/Perp/98/2c
JKudul asli : "Conversational Power : the Key to Success with People"
No Inv.: 3200-3204/P/Perp/99/5c
No Inv.: 3180-3184/P/Perp/99/5c
No Inv.: 4262-4266/P/Perp/99/5c
No Inv.: 4097-4101/P/Perp/98/5c
Judul asli : "Process of Educational Planning"