Bibliografi : hlm. 291-305 No Inv.: 137593-137594/P/Perp/14/2c~140742/PH/Perp/14/1c
No Inv.: 135836/SM/Perp/13/1c
Bibliografi : hlm.176-178 No Inv.: 75775/S/01/1c
Bibliografi : hlm. 239 No Inv.: 141040/PSM/Perp/14/1c
No Inv.: 140651/SM/Perp/14/1c
Bibliografi : hlm. 307-330
Judul asli :"Business Professional communications"
Bibliografi : hlm 241-244
No Inv.: 111893-111895/P/Perp/08/3c~114834/PH/Perp/08/1c
Bibliografi : hlm. 167-171 No Inv.: 136860-136864/P/Perp/14/5c