APA (7th ed.) Citation

Olson, W. C., & Groom, A. J. R. (1991). International relations then and now : origins and trends in interpretation / William C. Olson, A.J.R. Groom: Origins and trends in interpretation. HarperCollins.

Chicago Style (17th ed.) Citation

Olson, William C., and A. J. R. Groom. International Relations Then and Now : Origins and Trends in Interpretation / William C. Olson, A.J.R. Groom: Origins and Trends in Interpretation. London: HarperCollins, 1991.

MLA (9th ed.) Citation

Olson, William C., and A. J. R. Groom. International Relations Then and Now : Origins and Trends in Interpretation / William C. Olson, A.J.R. Groom: Origins and Trends in Interpretation. HarperCollins, 1991.

Warning: These citations may not always be 100% accurate.