Todaro, Michael P., author
Longman, 1992
Buku Teks
The World Bank; Dono Sumardi, translator
Salemba Empat, 2006
Buku Teks
Handelman, Howard, author
Pearson/Prentice Hall, 2006
Buku Teks
Fryer, D.W., author
McGraw-Hill, 1965
Buku Teks
HMSO , 1995
Buku Teks