APA (7e ed.) Bronvermelding

Não informado. (1959). Handbook. Department of Mineral end Energy Affairs.

Chicago (17e ed.) Bronvermelding

Não informado. Handbook. Pretoria, Africa do Sul: Department of Mineral end Energy Affairs, 1959.

MLA (8e ed.) Bronvermelding

Não informado. Handbook. Department of Mineral end Energy Affairs, 1959.

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