Bryant, John
Cornel Univ. Press, 1969
Buku Teks
edited by John Cleland and Benoit Ferry
Taylor & Francis Group, 1995
Buku Teks
edited by Jeffrey D. Sachs
University of Chicago Press, 1989
Buku Teks
edited by Roy Harrod
Martin Press, 1965
Buku Teks
World Bank , 1974
Buku Teks