Corey, Paul
Funk & Wagnalls,, 1975
Buku Teks
Shanbrom, Corey, author
W.H. Freeman and Company, 2012
Buku Teks
Johnson, J. Richard, author
John F. Rider, 1962
Buku Teks
Emmerichs, Jack, author
Summit PA. Tab Books, 1983
Buku Teks
Kay, Frances, author
Institute of South East Asia Studies, 2009
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