APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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