Thoman, R. S. (1967). Geography of international trade. Englewood Cliffs, N.J: Prentice-Hall.
Chicago Style aipamenaThoman, Richard S. Geography of International Trade. Englewood Cliffs, N.J: Prentice-Hall, 1967.
MLA aipamenaThoman, Richard S. Geography of International Trade. Englewood Cliffs, N.J: Prentice-Hall, 1967.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.