Folsom, Ralph Haughwout
International trade and investment
[publisher not identified], [date of publication not identified]
 Buku Teks
Bertrams, Roeland F.
Bank guarantees in international trade
Kluwer Law International, 1996
 Buku Teks
Horn, Paul V.
International trade principles and practices
Prentice-Hall, 1959
 Buku Teks
Finance of international trade
The National Bank, 1979
 Buku Teks
Finance of international trade
National Australia, 1990
 Buku Teks