BROWN, T.J. et al. World Mineral Production 2015-19. Keyworth, Nottingham: British Geological Survey, 2021.
ISBN 978-0-85272-790-4 .
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ISBN 978-3319912288
CLAYTON, Blake C. Commodity Markets and the Global Economy. Cambridge University Press, 2015.
ISBN 978-1107042513 .
WAGNER, Lorie A. Materials in the economy: material flows, scarcity, and the environment. Denver: U.S. Geological Survey, 2002.
ISBN 0-607-98412-0.