Schultz, Theodore W.
The Minchigan of Univ. Press, 1966
Buku Teks
McNulty, James E., author
University of Pennsylvania Press, 1964
Buku Teks
Sachs, Ignacy
Polish Scientific Publishers , 1964
Buku Teks
World Bank
Oxford University Press, 1982
Buku Teks
Boulding, Kenneth E. (Kenneth Ewart), 1910-1993, author
Harper and Brother Publishers, 1953
Buku Teks