Bibliografi : hlm. 90 No Inv.: 139599-139601/P/Perp/14/3c
No Inv.: 131226/PH/Perp/12/1c~136581/SM/Perp/13/1c~140602/SM/Perp/14/1c
Bibliografi : hlm. 178
No Inv.: 320/P/Perp/98/1c
Judul asli : "Materials Handling Equipment"
No. Inv. : 146044/S/Perp/15/1c
Bibliografi : hlm. 319-325