Cita APA (7a ed.)

Olson, W. C., & Groom, A. (1991). International relations then and now: Origins and trends in interpretation. Harper Collins Academic.

Cita Chicago Style (17a ed.)

Olson, William C., y A.J.R Groom. International Relations Then and Now: Origins and Trends in Interpretation. London: Harper Collins Academic, 1991.

Cita MLA (8a ed.)

Olson, William C., y A.J.R Groom. International Relations Then and Now: Origins and Trends in Interpretation. Harper Collins Academic, 1991.