Não informado. (1969). Minerals science and engineering. National Institute for Metallurgy.
Chicago (17e ed.) BronvermeldingNão informado. Minerals Science and Engineering. Cottesloe, Africa do Sul: National Institute for Metallurgy, 1969.
MLA (8e ed.) BronvermeldingNão informado. Minerals Science and Engineering. National Institute for Metallurgy, 1969.
Let op: Deze citaties zijn niet altijd 100% accuraat.