Bibliografi : hlm. 120-121
No Inv.: 1298-1300/P/Perp/95/3c~2568/P/Perp/85/1c
Bibliografi : hlm. 211-226
Bibliografi : hlm. 263
Judul asli : "Fachkunde fur Elektroberufe"
No Inv.: 1390-1414/P/Perp/92/5c~135368/SM/Perp/13/1c
No Inv.: 87153-87154/P/Perp/03/2c
No Inv.: 134388/SM/Perp/13/1c~135815/SM/Perp/13/1c