APA (7th ed.) Citation

Helms, L. L. (2009). Potential theory. Springer London.

Chicago Style (17th ed.) Citation

Helms, Lester L. Potential Theory. London: Springer London, 2009.

MLA (8th ed.) Citation

Helms, Lester L. Potential Theory. Springer London, 2009.

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