Bibliografi : hlm. 294-295No Inv.: 134952/SM/Perp/13/1c~135764/SM/Perp/13/1c
No Inv.: 130775/SM/Perp/12/1c
Judul asli :" Engineers at Work Salvage at Sea"
Judul asli : Prestressed concrete, third edition
No Inv.: 116581/SM/Perp/09/1c~140646/SM/Perp/14/1c