Cita APA (7a ed.)

Sobral, J. M. (1913). Contributions to the geology of the Nordingra region. Almquist & Wiksells boktryckeri.

Cita Chicago Style (17a ed.)

Sobral, José M. Contributions to the Geology of the Nordingra Region. Uppsala: Almquist & Wiksells boktryckeri, 1913.

Cita MLA (8a ed.)

Sobral, José M. Contributions to the Geology of the Nordingra Region. Almquist & Wiksells boktryckeri, 1913.