Group techniques / Gerald Corey ...[et al.].
by Gerald Corey ... [and others]
Brooks/Cole, 1982
 Buku Teks SO
Morton, Kathryn
Trade and developing countries / Kathryn Morton and Peter Tulloch
English Language Book Society, 1978
 Buku Teks
Levin, Jonathan V.
The export economies : their pattern of development in historical perspective / Jonathan V. Levin
Harvard University Press , 1960
 Buku Teks
Zenoff, David B.
Private enterprise in the developing countries / David B. Zenoff
Prentice-Hall, 1969
 Buku Teks SO
Verbit, Gilbert P.
Trade agreements for developing countries
Columbia University Press, 1969
 Buku Teks SO