Não informado. (1919). Mining and Metallurgy. American Institute of Mining and Metallurgical Engineers.
Chicago (17e ed.) BronvermeldingNão informado. Mining and Metallurgy. New York: American Institute of Mining and Metallurgical Engineers, 1919.
MLA (8e ed.) BronvermeldingNão informado. Mining and Metallurgy. American Institute of Mining and Metallurgical Engineers, 1919.
Let op: Deze citaties zijn niet altijd 100% accuraat.