Bibliografi : hlm. 255-256
No Inv.: 129068/S/Perp/10/1c
Judul asli : "Personal Letters for Business People"
Judul asli : "Office Manajemen"
No Inv.: 143860-143864/P/Perp/14/5c
No Inv.: 86792-86801/P/Perp/03/10c
No Inv.: 124739-124743/P/Perp/10/5c
Judul asli : "Planning and Design of Airports"Bibliografi: hlm. 320
No Inv.: 86789-86791/P/Perp/03/3c~114433-114437/P/Perp/08/5c~118545-118547/P/Perp/09/3c