Faulkner, Harold Underwood
Harper , 1950
Buku Teks
Adams, James Truslow, author
1946
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