Não informado. (1959). Handbook. Department of Mineral end Energy Affairs.
Style de citation Chicago (17e éd.)Não informado. Handbook. Pretoria, Africa do Sul: Department of Mineral end Energy Affairs, 1959.
Style de citation MLA (8e éd.)Não informado. Handbook. Department of Mineral end Energy Affairs, 1959.
Attention : ces citations peuvent ne pas être correctes à 100%.