Huebner, G. G., & Kramer, R. L. (1942). Foreign trade principles and practices. Appleton-Century-Crofts.
Cita Chicago (17th ed.)Huebner, Grover Gerhardt, i Roland Laird Kramer. Foreign Trade Principles and Practices. New York: Appleton-Century-Crofts, 1942.
Cita MLA (9th ed.)Huebner, Grover Gerhardt, i Roland Laird Kramer. Foreign Trade Principles and Practices. Appleton-Century-Crofts, 1942.
Atenció: Aquestes cites poden no estar 100% correctes.