Bibliografi : hlm. 239-240 No Inv.: 135854/Sm/Perp/13/1c
Bibliografi : hlm. 314-331 No Inv.: 141084/PSM/Perp/14/1c
No Inv.: 120809/SM/Perp/09/1c
No Inv.: 134600/SM/Perp/13/1c
No Inv.: 80532-80538,80540-80545/P/02/14c~85457-85461~85452-85456/Perp/P/FIS/03/10~100692-100699/P/Perp/05/8c
No Inv.: 126962-126966/P/perp/10/5c~127632-127636/P/Perp/10/5c
Judul asli :"Business Professional communications"
No Inv.: 114069/P/Perp/08/1c
No Inv.: 89283/S/Perp/04/1c
No Inv.: 115885-115887/P/Perp/09/3c