editor Thomas C. Cochran, Wayne Andrew
Charles Scribner's Sons , 1962
Buku Referensi
editor, Gorton Carruth
Thomas Y. Growell, 1962
Buku Referensi
U.S. Information Service,, 1981
Buku Teks
Herget, James E.
Texas: Rice University Press, 1990,
Buku Referensi
Horwitz, Morton J., author
Harvard University Press, 1977
Buku Teks