APA (7e ed.) Bronvermelding

Não informado. (1946). Mining Survey. Transvaal and Orange Free State Chamber of Mines.

Chicago (17e ed.) Bronvermelding

Não informado. Mining Survey. Johannesburg, Africa do Sul: Transvaal and Orange Free State Chamber of Mines, 1946.

MLA (8e ed.) Bronvermelding

Não informado. Mining Survey. Transvaal and Orange Free State Chamber of Mines, 1946.

Let op: Deze citaties zijn niet altijd 100% accuraat.