Sario, L., Nakai, M., Wang, C., & Chung, L. O. (1977). Classification theory of Riemann manifolds: Harmonic, quasiharmonic and biharmonic functions. Springer-Verlag.
Lua i Stíl Chicago (17ú heag.)Sario, Leo, Mitsuru Nakai, Cecilia Wang, agus Lung Ock Chung. Classification Theory of Riemann Manifolds: Harmonic, Quasiharmonic and Biharmonic Functions. Berlín: Springer-Verlag, 1977.
Lua MLA (9ú heag.)Sario, Leo, et al. Classification Theory of Riemann Manifolds: Harmonic, Quasiharmonic and Biharmonic Functions. Springer-Verlag, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.