APA (7th ed.) Citation

Roskin, M., & Berry, N. O. IR, an introduction to international relations.

Chicago Style (17th ed.) Citation

Roskin, Michael, and Nicholas O. Berry. IR, an Introduction to International Relations.

MLA (8th ed.) Citation

Roskin, Michael, and Nicholas O. Berry. IR, an Introduction to International Relations.

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