APA Edition Citation

Groom, A. J. R., Barrinha, A., & Olson, W. C. (2019). International relations then and now: Origins and trends in interpretation (2nd ed.). Routledge.

Chicago Edition Citation

Groom, A J R., Andre Barrinha, and William C. Olson. International Relations Then and Now: Origins and Trends in Interpretation. 2nd ed. London: Routledge, 2019.

MLA Edition Citation

Groom, A J R., et al. International Relations Then and Now: Origins and Trends in Interpretation. 2nd ed. Routledge, 2019.