Kregel, J.A.
Macmillan, 1974
Buku Teks
Bagchi, Amiya Kumar, author
Cambridge University Press , 1984
Buku Teks
Bhagwati, Jagdish, author
MIT Press, c1991
Buku Teks
Archibald, W. Peter (William Peter), 1943-, author
McGraw-Hill Ryerson, 1978
Buku Teks
Stanford University Press, 1988
Buku Teks