Bladen, Ashby
McGraw-Hill, 1981
Buku Teks
Myers, Margaret G., author
Columbia University Press , 1970
Buku Teks
Harris, Seymour E.
McGraw-Hill Book Co., 1947
Buku Teks
edited by J. Fred Weston
Holt, Rinehart and Winston, 1966
Buku Teks
Hamilton, Alexander, author
Columbia University Press , 1934
Buku Teks