No Inv.: 14483-14485/P/Perp/94/3c
Judul asli :"Business Professional communications"
Bibliografi : hlm. 255-274No Inv.: 138209-138210/P/Perp/14/2c~143965/P/Perp/14/1c
Bibliografi : hlm 237-255
No Inv.: 78320/01/1c~112497-112500/P/Perp/08/4c~117581-117582/P/Perp/09/2c
Judul asli : " Competitive intelligence"
No Inv.: 127692-127696/P/Perp/10/5c
Bibliografi : hlm 179