APA (7th ed.) Citation

Barry, N. P. (1989). An introduction to modern political theory. Macmillan.

Chicago Style (17th ed.) Citation

Barry, Norman P. An Introduction to Modern Political Theory. Houndmills, Basingstoke, Hampshire: Macmillan, 1989.

MLA (9th ed.) Citation

Barry, Norman P. An Introduction to Modern Political Theory. Macmillan, 1989.