APA (7th ed.) Citation

Helm, D. (1989). Economic borders of the state. Oxford University Press.

Chicago Style (17th ed.) Citation

Helm, Dieter. Economic Borders of the State. Oxford University Press, 1989.

MLA (9th ed.) Citation

Helm, Dieter. Economic Borders of the State. Oxford University Press, 1989.

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