Langman, Larry, author
Encyclopedia of American spy films
Garland Pub, 1990
 Buku Referensi
The encyclopedia American
Americana Corporation, 1980
 Buku Referensi
The encyclopedia American
Americana Corporation, 1980
 Buku Referensi
Morris, Richard B., author
Encyclopedia of American history
Harper & Row, 1961
 Buku Teks
Paneth, Donald, author
The Encyclopedia of American journalism
Facts on File, 1983
 Buku Referensi
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