Bradley, Carolyn G
Appleton-Century-Crofts , 1954
Buku Teks
Johnson, Elmer D., author
The Scarecrow Press, 1970
Buku Teks
Cheney, L.J, author
The New American Library , 1959
Buku Teks
Fuller, John Frederick Charles, author
Funk and Wagnalls, 1955
Buku Teks
Good, H. G.
Macmillan, 1961
Buku Teks