एपीए उद्धरण

Helffer, B., & Nier, F. (2005). Hypoelliptic estimates and spectral theory for Fokker-Plank operators and witten Laplacians. Springer-Verlag.

शिकागो स्टाइल उद्धरण

Helffer, Bernard, और Francis Nier. Hypoelliptic Estimates and Spectral Theory for Fokker-Plank Operators and Witten Laplacians. Germany: Springer-Verlag, 2005.

एमएलए उद्धरण

Helffer, Bernard, और Francis Nier. Hypoelliptic Estimates and Spectral Theory for Fokker-Plank Operators and Witten Laplacians. Springer-Verlag, 2005.