Judul asli : "Effective Supervision in a Factory"
No Inv.: 5039-3041/S/Perp/86/3c
No Inv.: 129422/SM/Perp/11/1c
No Inv.: 129425/SM/Perp/11/1c
No Inv.: 129432/SM/Perp/11/1c
No Inv.: 134089/PSM/Perp/13/1c
No Inv.: 8325-8329/P/Perp/92/5c~433-434/P/Perp/92/2c~713-715/P/Perp/92/3c~1232/S/Perp/88/1c~1655/S/Perp/87/1c~994/S/Perp/87/1c~1780/S/Perp/88/1c~76390-76391/S/01/2c
No Inv.: 109669-109670/S/Perp/07/2c~115151/S/Perp/08/1c
No Inv.: 129934/SM/Perp/11/1c
No Inv.: 124944-124948/P/Perp/10/5c