APA
Olson W. C., Olson W. C., . (1991). The theory and practice of international relations. New Jersey: Prentice-Hall.
Chicago
Olson William Clinton, Olson William Clinton, . 1991. The theory and practice of international relations. New Jersey: Prentice-Hall.
Harvard
Olson W. C., Olson W. C., . (1991). The theory and practice of international relations. New Jersey: Prentice-Hall.
MLA
Olson William Clinton, Olson William Clinton, . The theory and practice of international relations. New Jersey: Prentice-Hall. 1991.