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Oxford University Press, 2014
Buku Teks
Mitra, Devashish, author
NJ World Scientific, 2016
Buku Teks
Killick, Tony
Routledge Press , 1998
Buku Teks
Henry Holt and Company , 1955
Buku Teks
Robbins, Lionel Robbins, Baron, 1898-1984, editor
McMillan & Co., 1952
Buku Teks