Robinson, Joan, author
Basil Blackwell, 1960
Buku Teks
Buchanan, James M., author
Liberty Fund, Inc., 2000
Buku Referensi
Taylor, O.H., author
Harvard University Press, 1955
Buku Teks
edited by Joseph E. Stiglitz
MIT Press, 1966
Buku Teks
Boulding, Kenneth E. (Kenneth Ewart), 1910-1993, author
Harper & Row, 1966
Buku Teks