Newman, David M., author
McGraw-Hill , 2012
Buku Teks
Tead, Diana, author
Educational, Scientific and Cultural Organization, 1952
Buku Teks
Klass, Morton
J.B. Lippincott, 1971.
Buku Teks
Kibria, Nazli, author
Polity Press, 2014
Buku Teks
Len Platt
Cambridge University Press, 2011
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