Não informado. (1949). Mining transactions. American Institute of Mining, Metallurgical and Petroleum Engineers.
Chicago (17e ed.) BronvermeldingNão informado. Mining Transactions. New York: American Institute of Mining, Metallurgical and Petroleum Engineers, 1949.
MLA (8e ed.) BronvermeldingNão informado. Mining Transactions. American Institute of Mining, Metallurgical and Petroleum Engineers, 1949.
Let op: Deze citaties zijn niet altijd 100% accuraat.