APA-viite

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

Chicago-tyylinen lähdeviittaus

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

MLA-viite

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