Aboyade, Ojetunji, author
Praeger, 1966
Buku Teks
Hicks, George L., author
Cornell University Press, 1971
Buku Teks
Law, Christopher M., author
Continuum, 2002
Buku Teks
Harberger, Arnold C.
International Center for Economic Growth , 1985
Buku Teks
edited by Dilip K. Das
Prentice-Hall, 1996
Buku Teks