Kahin, George McTurnan, author
Dial Press , 1967
Buku Teks
Alden, John Richard, author
American Book Company, 1960
Buku Teks
Dumbauld, Edward, author
University of Oklahoma Press, 1946
Buku Teks
Antieau, Chester James, author
Dennis & Co., 1960
Buku Teks
Bemis, Samuel Flagg, 1891-1973, author
Holt, Rinehart and Winston, 1965
Buku Teks