Whitten, Kenneth W., Davis, Raymond E., Peck, M. Larry. General Chemistry. 6th. Fort Worth, TX, Saunders College Publishing/Harcourt College Publishers, 2000. ISBN 9780030723735. с. 15.
Wilbraham, Antony, Matta, Michael, Staley, Dennis. Chemistry. 1st. Upper Saddle River, NJ, Prentice Hall, 2002. ISBN 0132512106. с. 36.
Proust, J.-L. (1799). Researches on copper, Ann. chim., 32:26-54. Excerpt, in Henry M. Leicester and Herbert S. Klickstein, A Source Book in Chemistry, 1400—1900, Cambridge, MA: Harvard, 1952. Accessed 2008-05-08
