Bibliografi : hlm. 319 - 323
No Inv.: 28/S/Perp/95/1c~2643-2652/P/Perp/97/10c~1960-1969/P/Perp/98/10c
Bibliografi : lembar 171-172
Judul asli : "Modern Office Management"
Bibliografi : hlm. 255-256
No Inv.: 129068/S/Perp/10/1c
Judul asli : "Personal Letters for Business People"
Judul asli : "Office Manajemen"
No Inv.: 4077-4081/P/Perp/98/5c
No Inv.: 143860-143864/P/Perp/14/5c