Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (8ú heag.)

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

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