No Inv.: 132917/SM/Perp/12/1c~135037/SM/Perp/13/1c~135206/SM/Perp/13/1c
No Inv.: 126997-127001/P/Perp/10/5c
No Inv.: 112814/P/Perp/08/1c~125301-125305/P/Perp/10/5c~142917-142921/P/Perp/14/5c
No Inv.: 121737-121741/P/Perp/09/5c~137111-137113/P/Perp/13/3c
No Inv.: 116535-116537/P/Perp/09/3c~125668-125677/P/Perp/10/10c~138232-138236/P/Perp/14/5c
Judul asli :"Business Professional communications"
Bibliografi : hlm. 211-233