Bibliografi : hlm. 345-351
Judul asli : "Economics"
Bibliografi : hlm. 159-164; No Inv.: 140537/Sm/Perp/14/1c~146664,146665/P/Perp/14/2c
No Inv.: 131800/S/Perp/12/1c
No Inv.: 120955/S/Perp/09/1c
No Inv.: 85690/S/Perp/03/1c~120498/SM/Perp/09/1c
No Inv.: 122732-122736/P/Perp/10/5c~143737-143739/P/Perp/14/3c