APA (7th ed.) Citation

Callaghan, J., O'Connor, B., & Phythian, M. Ideologies of American foreign policy.

Chicago Style (17th ed.) Citation

Callaghan, John, Brendon O'Connor, and Mark Phythian. Ideologies of American Foreign Policy.

MLA (9th ed.) Citation

Callaghan, John, et al. Ideologies of American Foreign Policy.