एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

Helms, Lester. Potential Theory. New York: Springer, 2009.

एमएलए उद्धरण

Helms, Lester. Potential Theory. Springer, 2009.