Johnson, J. Richard, author
John F. Rider, 1962
Buku Teks
Steinberg, Dave S., author
Wiley, 1980
Buku Teks
Money, Steve, author
PC Publishing, 1990
Buku Referensi
Emmerichs, Jack, author
Summit PA. Tab Books, 1983
Buku Teks
Kay, Frances, author
Institute of South East Asia Studies, 2009
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