Bibliografi : hlm. 262-273
No Inv.: 89579-89580/PSM/Perp/04/2c
Judul asli :"Control Your Overheads"
No Inv.: 14483-14485/P/Perp/94/3c
No Inv.: 85074-85078/P/Perp/FIS/03/5c
No Inv.: 3810/P/99/1c
No Inv.: 2791/P/Perp/96/1c
No Inv.: 10961/P/Perp/98/1c~3462/P/Perp/99/1c
No Inv.: 137141/P/Perp/14/1c~143964/P/Perp/14/1c
Judul asli :"Business Professional communications"