Arnold, H.J.P., author
Dufour Editions, 1966
Buku Teks
Khan, Mohsin S., author
International Monetary Fund, 1985
Buku Teks
Gill, Richard T. (Richard Thomas), 1927-2010, author
Prentice-Hall, 1963, 1967
Buku Teks
edited by Clifton R. Wharton
Aldine Publishig, 1969
Buku Teks
Todaro, Michael P., author
Longman, 1992
Buku Teks