APA (7th ed.) Citation

Spahn, H. (2012, April). On the theory of interest rate policy. PSL Quarterly Review.

Chicago Style (17th ed.) Citation

Spahn, Heinz-Peter. "On the Theory of Interest Rate Policy." PSL Quarterly Review Apr. 2012.

MLA (9th ed.) Citation

Spahn, Heinz-Peter. "On the Theory of Interest Rate Policy." PSL Quarterly Review, Apr. 2012.

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