APA (7th ed.) Citation

Soen, O. I. (1958). The geology, petrology and ore deposits of the Viseu region, northern Portugal .. Drukkerij Holland N. V..

Chicago Style (17th ed.) Citation

Soen, Oen Ing. The Geology, Petrology and Ore Deposits of the Viseu Region, Northern Portugal .. Amsterdam: Drukkerij Holland N. V., 1958.

MLA (8th ed.) Citation

Soen, Oen Ing. The Geology, Petrology and Ore Deposits of the Viseu Region, Northern Portugal .. Drukkerij Holland N. V., 1958.