Alden, John Richard, author
American Book Company, 1960
Buku Teks
Bartov, Merwin, author
Funk Wagnalis Company, 1952
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