APA (7th ed.) Citation

Krugman, P. R. (1989). Exchange-rate instability. MIT Press.

Chicago Style (17th ed.) Citation

Krugman, Paul R. Exchange-rate Instability. Cambridge, Mass. [etc.]: MIT Press, 1989.

MLA (9th ed.) Citation

Krugman, Paul R. Exchange-rate Instability. MIT Press, 1989.