Bibliografi : hlm. 119-121
Bibliografi : hlm. 185-187
No Inv.: 100765-100767/P/Perp/05/3c
Judul asli : "Research Methods and Analysis Searching for Relationahips"
Bibliografi : hlm. 293-294
Judul asli : "Electrical Instalation Technology"
No Inv.: 2874-2883/P/Perp/97/10c
Judul asli : "Economic Development in the Third World"