The New York Times Encyclopedic almanac 1970
editor in-chief, Seymour Kurtz
New York Times, c1969
 Buku Referensi
The New York times 2004 almanac
edited by John W. Wrigth
Penguin Group, 2003
 Buku Referensi
The World almanac and book of facts 1988
Newspaper Enterprise Association, 1987
 Buku Referensi
The World almanac and book of facts 1986
Newspaper Enterprise Association, 1985
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The World almanac and book of facts 1983
Newspaper Enterprise Association, 1982
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