Sachs, Jeffrey D., author
Random House, 2012
Buku Teks
Bernstein, Peter L
Doubleday Company, 1962
Buku Teks
Wernette, Philip
Macmillan, 1955
Buku Teks
Battaly, Heather D., 1969-, author
Polity, 2015
Buku Teks
Ni, Xia, author
China Renmin Universitiy, 2015
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