Fall, Bernard B.
Doubleday, 1967
Buku Teks
Souter, Gerry, author
Andre Deutsch, 2015
Buku Referensi
Webb, James, author
Bantam Books, 2001
Buku Teks
editor in chief, Stanley I. Kutler
Charles Scribner's Sons, 1996
Buku Referensi
Macmillan Digital USA, 1995
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