edited by Frank Freidel and Norman Pollack
Rand McNally, 1963
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Buku Referensi
editor Thomas C. Cochran, Wayne Andrew
Charles Scribner's Sons , 1962
Buku Referensi
U.S. Information Service,, 1981
Buku Teks
Herget, James E.
Texas: Rice University Press, 1990,
Buku Referensi